667212428087 has 4 divisors (see below), whose sum is σ = 667458362400. Its totient is φ = 666966493776.

The previous prime is 667212428063. The next prime is 667212428203. The reversal of 667212428087 is 780824212766.

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 667212428087 - 2²⁰ = 667211379511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667212428017) 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, 122963087 + ... + 122968512.

It is an arithmetic number, because the mean of its divisors is an integer number (166864590600).

Almost surely, 2^667212428087 is an apocalyptic number.

667212428087 is a deficient number, since it is larger than the sum of its proper divisors (245934313).

667212428087 is a wasteful number, since it uses less digits than its factorization.

667212428087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245934312.

The product of its (nonzero) digits is 3612672, while the sum is 53.

The spelling of 667212428087 in words is "six hundred sixty-seven billion, two hundred twelve million, four hundred twenty-eight thousand, eighty-seven".