668077881 has 8 divisors (see below), whose sum is σ = 909723264. Its totient is φ = 435908880.

The previous prime is 668077859. The next prime is 668077913. The reversal of 668077881 is 188770866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668077881 - 2¹¹ = 668075833 is a prime.

It is a super-2 number, since 2×668077881² = 892656110162900322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668077841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2368930 + ... + 2369211.

It is an arithmetic number, because the mean of its divisors is an integer number (113715408).

Almost surely, 2^668077881 is an apocalyptic number.

It is an amenable number.

668077881 is a deficient number, since it is larger than the sum of its proper divisors (241645383).

668077881 is a wasteful number, since it uses less digits than its factorization.

668077881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738191.

The product of its (nonzero) digits is 903168, while the sum is 51.

The square root of 668077881 is about 25847.2025759075. The cubic root of 668077881 is about 874.1964349441.

The spelling of 668077881 in words is "six hundred sixty-eight million, seventy-seven thousand, eight hundred eighty-one".