65915896981 has 16 divisors (see below), whose sum is σ = 72258645888. Its totient is φ = 59632038400.

The previous prime is 65915896933. The next prime is 65915896999. The reversal of 65915896981 is 18969851956.

65915896981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65915896981 - 2¹³ = 65915888789 is a prime.

It is a super-2 number, since 2×65915896981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65915896901) 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, 2814801 + ... + 2838121.

It is an arithmetic number, because the mean of its divisors is an integer number (4516165368).

Almost surely, 2^65915896981 is an apocalyptic number.

It is an amenable number.

65915896981 is a deficient number, since it is larger than the sum of its proper divisors (6342748907).

65915896981 is a wasteful number, since it uses less digits than its factorization.

65915896981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24572.

The product of its digits is 41990400, while the sum is 67.

The spelling of 65915896981 in words is "sixty-five billion, nine hundred fifteen million, eight hundred ninety-six thousand, nine hundred eighty-one".