65615181864081 has 16 divisors (see below), whose sum is σ = 88403865371328. Its totient is φ = 43285474008000.

The previous prime is 65615181864049. The next prime is 65615181864109. The reversal of 65615181864081 is 18046818151656.

It is not a de Polignac number, because 65615181864081 - 2⁵ = 65615181864049 is a prime.

It is a super-2 number, since 2×65615181864081² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65615181868081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61664251 + ... + 62719296.

It is an arithmetic number, because the mean of its divisors is an integer number (5525241585708).

Almost surely, 2^{65615181864081} is an apocalyptic number.

It is an amenable number.

65615181864081 is a deficient number, since it is larger than the sum of its proper divisors (22788683507247).

65615181864081 is a wasteful number, since it uses less digits than its factorization.

65615181864081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124385392.

The product of its (nonzero) digits is 11059200, while the sum is 60.

The spelling of 65615181864081 in words is "sixty-five trillion, six hundred fifteen billion, one hundred eighty-one million, eight hundred sixty-four thousand, eighty-one".