65531939649658 has 16 divisors (see below), whose sum is σ = 99391657715136. Its totient is φ = 32402696173120.

The previous prime is 65531939649641. The next prime is 65531939649667. The reversal of 65531939649658 is 85694693913556.

It is a super-2 number, since 2×65531939649658² (a number of 28 digits) contains 22 as substring.

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, 327173398 + ... + 327373633.

It is an arithmetic number, because the mean of its divisors is an integer number (6211978607196).

Almost surely, 2^{65531939649658} is an apocalyptic number.

65531939649658 is a deficient number, since it is larger than the sum of its proper divisors (33859718065478).

65531939649658 is a wasteful number, since it uses less digits than its factorization.

65531939649658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654547589.

The product of its digits is 5668704000, while the sum is 79.

The spelling of 65531939649658 in words is "sixty-five trillion, five hundred thirty-one billion, nine hundred thirty-nine million, six hundred forty-nine thousand, six hundred fifty-eight".