65512052640 has 192 divisors, whose sum is σ = 230495569920. Its totient is φ = 17378196480.

The previous prime is 65512052633. The next prime is 65512052653. The reversal of 65512052640 is 4625021556.

65512052640 is a `hidden beast` number, since 6 + 5 + 5 + 1 + 2 + 0 + 5 + 2 + 640 = 666.

It is a super-2 number, since 2×65512052640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65512052595 and 65512052604.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 785422 + ... + 864818.

It is an arithmetic number, because the mean of its divisors is an integer number (1200497760).

Almost surely, 2^65512052640 is an apocalyptic number.

65512052640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65512052640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115247784960).

65512052640 is an abundant number, since it is smaller than the sum of its proper divisors (164983517280).

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

65512052640 is a wasteful number, since it uses less digits than its factorization.

65512052640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79612 (or 79598 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 65512052640 in words is "sixty-five billion, five hundred twelve million, fifty-two thousand, six hundred forty".