666055031 has 4 divisors (see below), whose sum is σ = 666318072. Its totient is φ = 665791992.

The previous prime is 666055021. The next prime is 666055037. The reversal of 666055031 is 130550666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666055031 - 2⁶ = 666054967 is a prime.

It is a super-2 number, since 2×666055031² = 887258608640821922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666055037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127685 + ... + 132798.

It is an arithmetic number, because the mean of its divisors is an integer number (166579518).

Almost surely, 2^666055031 is an apocalyptic number.

666055031 is a deficient number, since it is larger than the sum of its proper divisors (263041).

666055031 is a wasteful number, since it uses less digits than its factorization.

666055031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263040.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 666055031 is about 25808.0419830719. The cubic root of 666055031 is about 873.3132265084.

The spelling of 666055031 in words is "six hundred sixty-six million, fifty-five thousand, thirty-one".