65630440657 has 8 divisors (see below), whose sum is σ = 66690337896. Its totient is φ = 64578365952.

The previous prime is 65630440639. The next prime is 65630440679. The reversal of 65630440657 is 75604403656.

65630440657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 27760891456 + 37869549201 = 166616^2 + 194601^2 .

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 65630440657 - 2¹⁵ = 65630407889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65630447657) 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, 1938718 + ... + 1972279.

It is an arithmetic number, because the mean of its divisors is an integer number (8336292237).

Almost surely, 2^65630440657 is an apocalyptic number.

It is an amenable number.

65630440657 is a deficient number, since it is larger than the sum of its proper divisors (1059897239).

65630440657 is a wasteful number, since it uses less digits than its factorization.

65630440657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911267.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 65630440657 in words is "sixty-five billion, six hundred thirty million, four hundred forty thousand, six hundred fifty-seven".