65512121088 has 72 divisors (see below), whose sum is σ = 174447943488. Its totient is φ = 21826081792.

The previous prime is 65512121069. The next prime is 65512121107. The reversal of 65512121088 is 88012121556.

It is an interprime number because it is at equal distance from previous prime (65512121069) and next prime (65512121107).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1535695 + ... + 1577777.

It is an arithmetic number, because the mean of its divisors is an integer number (2422888104).

Almost surely, 2^65512121088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65512121088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87223971744).

65512121088 is an abundant number, since it is smaller than the sum of its proper divisors (108935822400).

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

65512121088 is a wasteful number, since it uses less digits than its factorization.

65512121088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44129 (or 44115 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 39.

The spelling of 65512121088 in words is "sixty-five billion, five hundred twelve million, one hundred twenty-one thousand, eighty-eight".