65961997 has 8 divisors (see below), whose sum is σ = 67012920. Its totient is φ = 64915200.

The previous prime is 65961983. The next prime is 65962003. The reversal of 65961997 is 79916956.

It can be written as a sum of positive squares in 4 ways, for example, as 33767721 + 32194276 = 5811^2 + 5674^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65961997 - 2⁷ = 65961869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65961697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50529 + ... + 51817.

It is an arithmetic number, because the mean of its divisors is an integer number (8376615).

Almost surely, 2^65961997 is an apocalyptic number.

It is an amenable number.

65961997 is a deficient number, since it is larger than the sum of its proper divisors (1050923).

65961997 is a wasteful number, since it uses less digits than its factorization.

65961997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063.

The product of its digits is 918540, while the sum is 52.

The square root of 65961997 is about 8121.6991448834. The cubic root of 65961997 is about 404.0464218950.

The spelling of 65961997 in words is "sixty-five million, nine hundred sixty-one thousand, nine hundred ninety-seven".