667901871 has 96 divisors (see below), whose sum is σ = 1251169920. Its totient is φ = 333849600.

The previous prime is 667901869. The next prime is 667901879. The reversal of 667901871 is 178109766.

It is not a de Polignac number, because 667901871 - 2¹ = 667901869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667901879) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1448581 + ... + 1449041.

It is an arithmetic number, because the mean of its divisors is an integer number (13033020).

Almost surely, 2^667901871 is an apocalyptic number.

667901871 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

667901871 is a deficient number, since it is larger than the sum of its proper divisors (583268049).

667901871 is a wasteful number, since it uses less digits than its factorization.

667901871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 667901871 is about 25843.7975344182. The cubic root of 667901871 is about 874.1196570547.

The spelling of 667901871 in words is "six hundred sixty-seven million, nine hundred one thousand, eight hundred seventy-one".