65648857 has 4 divisors (see below), whose sum is σ = 69104080. Its totient is φ = 62193636.

The previous prime is 65648813. The next prime is 65648861. The reversal of 65648857 is 75884656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65648857 - 2⁷ = 65648729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65648857.

It is not an unprimeable number, because it can be changed into a prime (65648867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1727583 + ... + 1727620.

It is an arithmetic number, because the mean of its divisors is an integer number (17276020).

Almost surely, 2^65648857 is an apocalyptic number.

It is an amenable number.

65648857 is a deficient number, since it is larger than the sum of its proper divisors (3455223).

65648857 is a wasteful number, since it uses less digits than its factorization.

65648857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3455222.

The product of its digits is 1612800, while the sum is 49.

The square root of 65648857 is about 8102.3982252170. The cubic root of 65648857 is about 403.4060337649.

The spelling of 65648857 in words is "sixty-five million, six hundred forty-eight thousand, eight hundred fifty-seven".