668120961 has 16 divisors (see below), whose sum is σ = 946729728. Its totient is φ = 417657600.

The previous prime is 668120941. The next prime is 668120977. The reversal of 668120961 is 169021866.

It is not a de Polignac number, because 668120961 - 2¹⁵ = 668088193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668120911) 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, 10350 + ... + 37991.

It is an arithmetic number, because the mean of its divisors is an integer number (59170608).

Almost surely, 2^668120961 is an apocalyptic number.

It is an amenable number.

668120961 is a deficient number, since it is larger than the sum of its proper divisors (278608767).

668120961 is a wasteful number, since it uses less digits than its factorization.

668120961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48632.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 668120961 is about 25848.0359215164. The cubic root of 668120961 is about 874.2152249555.

The spelling of 668120961 in words is "six hundred sixty-eight million, one hundred twenty thousand, nine hundred sixty-one".