201664603671 has 24 divisors (see below), whose sum is σ = 285055787520. Its totient is φ = 126795813264.

The previous prime is 201664603643. The next prime is 201664603697. The reversal of 201664603671 is 176306466102.

It is not a de Polignac number, because 201664603671 - 2³⁴ = 184484734487 is a prime.

It is a super-2 number, since 2×201664603671² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201664603601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176001 + ... + 659018.

It is an arithmetic number, because the mean of its divisors is an integer number (11877324480).

Almost surely, 2^201664603671 is an apocalyptic number.

201664603671 is a deficient number, since it is larger than the sum of its proper divisors (83391183849).

201664603671 is a wasteful number, since it uses less digits than its factorization.

201664603671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835283 (or 835264 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 201664603671 in words is "two hundred one billion, six hundred sixty-four million, six hundred three thousand, six hundred seventy-one".