65981909510 has 32 divisors (see below), whose sum is σ = 129769945344. Its totient is φ = 23955372000.

The previous prime is 65981909509. The next prime is 65981909593. The reversal of 65981909510 is 1590918956.

It is a super-2 number, since 2×65981909510² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405896 + ... + 544715.

It is an arithmetic number, because the mean of its divisors is an integer number (4055310792).

Almost surely, 2^65981909510 is an apocalyptic number.

65981909510 is a deficient number, since it is larger than the sum of its proper divisors (63788035834).

65981909510 is a wasteful number, since it uses less digits than its factorization.

65981909510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951260.

The product of its (nonzero) digits is 874800, while the sum is 53.

The spelling of 65981909510 in words is "sixty-five billion, nine hundred eighty-one million, nine hundred nine thousand, five hundred ten".