667878201870 has 64 divisors (see below), whose sum is σ = 1824653827584. Its totient is φ = 154870305920.

The previous prime is 667878201821. The next prime is 667878201929. The reversal of 667878201870 is 78102878766.

It is a super-2 number, since 2×667878201870² (a number of 24 digits) contains 22 as substring.

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, 43989657 + ... + 44004836.

It is an arithmetic number, because the mean of its divisors is an integer number (28510216056).

Almost surely, 2^667878201870 is an apocalyptic number.

667878201870 is an abundant number, since it is smaller than the sum of its proper divisors (1156775625714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667878201870 is a wasteful number, since it uses less digits than its factorization.

667878201870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87994537.

The product of its (nonzero) digits is 12644352, while the sum is 60.

The spelling of 667878201870 in words is "six hundred sixty-seven billion, eight hundred seventy-eight million, two hundred one thousand, eight hundred seventy".