661922855 has 32 divisors (see below), whose sum is σ = 931599360. Its totient is φ = 446325120.

The previous prime is 661922843. The next prime is 661922861. The reversal of 661922855 is 558229166.

It is not a de Polignac number, because 661922855 - 2⁴ = 661922839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42377 + ... + 55853.

It is an arithmetic number, because the mean of its divisors is an integer number (29112480).

Almost surely, 2^661922855 is an apocalyptic number.

661922855 is a deficient number, since it is larger than the sum of its proper divisors (269676505).

661922855 is a wasteful number, since it uses less digits than its factorization.

661922855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13559.

The product of its digits is 259200, while the sum is 44.

The square root of 661922855 is about 25727.8614540735. The cubic root of 661922855 is about 871.5034799058.

The spelling of 661922855 in words is "six hundred sixty-one million, nine hundred twenty-two thousand, eight hundred fifty-five".