65638870052 has 24 divisors (see below), whose sum is σ = 131284266624. Its totient is φ = 28129545792.

The previous prime is 65638870043. The next prime is 65638870057. The reversal of 65638870052 is 25007883656.

It is a super-2 number, since 2×65638870052² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65638870057) 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, 678368 + ... + 769064.

It is an arithmetic number, because the mean of its divisors is an integer number (5470177776).

Almost surely, 2^65638870052 is an apocalyptic number.

It is an amenable number.

65638870052 is an abundant number, since it is smaller than the sum of its proper divisors (65645396572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65638870052 is a wasteful number, since it uses less digits than its factorization.

65638870052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116555 (or 116553 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 65638870052 in words is "sixty-five billion, six hundred thirty-eight million, eight hundred seventy thousand, fifty-two".