921777768961 has 16 divisors (see below), whose sum is σ = 1147143715200. Its totient is φ = 722700534528.

The previous prime is 921777768937. The next prime is 921777769021. The reversal of 921777768961 is 169867777129.

It is not a de Polignac number, because 921777768961 - 2¹⁷ = 921777637889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921777768061) 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, 119490280 + ... + 119497993.

It is an arithmetic number, because the mean of its divisors is an integer number (71696482200).

Almost surely, 2^921777768961 is an apocalyptic number.

It is an amenable number.

921777768961 is a deficient number, since it is larger than the sum of its proper divisors (225365946239).

921777768961 is a wasteful number, since it uses less digits than its factorization.

921777768961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238988328.

The product of its digits is 112021056, while the sum is 70.

The spelling of 921777768961 in words is "nine hundred twenty-one billion, seven hundred seventy-seven million, seven hundred sixty-eight thousand, nine hundred sixty-one".