167664591 has 12 divisors (see below), whose sum is σ = 256428432. Its totient is φ = 105201216.

The previous prime is 167664589. The next prime is 167664593. The reversal of 167664591 is 195466761.

It is an interprime number because it is at equal distance from previous prime (167664589) and next prime (167664593).

It is not a de Polignac number, because 167664591 - 2¹ = 167664589 is a prime.

It is a super-2 number, since 2×167664591² = 56222830150394562, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167664593) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 547771 + ... + 548076.

It is an arithmetic number, because the mean of its divisors is an integer number (21369036).

Almost surely, 2^167664591 is an apocalyptic number.

167664591 is a deficient number, since it is larger than the sum of its proper divisors (88763841).

167664591 is a wasteful number, since it uses less digits than its factorization.

167664591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095870 (or 1095867 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 167664591 is about 12948.5362493218. The cubic root of 167664591 is about 551.4173811056.

The spelling of 167664591 in words is "one hundred sixty-seven million, six hundred sixty-four thousand, five hundred ninety-one".