65993957 has 4 divisors (see below), whose sum is σ = 67239180. Its totient is φ = 64748736.

The previous prime is 65993927. The next prime is 65993959. The reversal of 65993957 is 75939956.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58232161 + 7761796 = 7631^2 + 2786^2 .

It is a cyclic number.

It is not a de Polignac number, because 65993957 - 2⁸ = 65993701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1245169 = 65993957 / (6 + 5 + 9 + 9 + 3 + 9 + 5 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65993899 and 65993908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65993959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622532 + ... + 622637.

It is an arithmetic number, because the mean of its divisors is an integer number (16809795).

Almost surely, 2^65993957 is an apocalyptic number.

It is an amenable number.

65993957 is a deficient number, since it is larger than the sum of its proper divisors (1245223).

65993957 is a wasteful number, since it uses less digits than its factorization.

65993957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245222.

The product of its digits is 2296350, while the sum is 53.

The square root of 65993957 is about 8123.6664751822. Note that the first 3 decimals coincide. The cubic root of 65993957 is about 404.1116677396. Note that the first 3 decimals are identical.

The spelling of 65993957 in words is "sixty-five million, nine hundred ninety-three thousand, nine hundred fifty-seven".