65161550988 has 18 divisors (see below), whose sum is σ = 164713920644. Its totient is φ = 21720516984.

The previous prime is 65161550959. The next prime is 65161551017. The reversal of 65161550988 is 88905516156.

65161550988 is a `hidden beast` number, since 6 + 5 + 1 + 6 + 1 + 550 + 9 + 88 = 666.

It is an interprime number because it is at equal distance from previous prime (65161550959) and next prime (65161551017).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×65161550988² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 905021506 + ... + 905021577.

Almost surely, 2^65161550988 is an apocalyptic number.

It is an amenable number.

65161550988 is an abundant number, since it is smaller than the sum of its proper divisors (99552369656).

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

65161550988 is a wasteful number, since it uses less digits than its factorization.

65161550988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1810043093 (or 1810043088 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 54.

It can be divided in two parts, 6516 and 1550988, that added together give a square (1557504 = 1248²).

The spelling of 65161550988 in words is "sixty-five billion, one hundred sixty-one million, five hundred fifty thousand, nine hundred eighty-eight".