71953973209531 has 8 divisors (see below), whose sum is σ = 82239117834464. Its totient is φ = 61670329983360.

The previous prime is 71953973209523. The next prime is 71953973209543. The reversal of 71953973209531 is 13590237935917.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71953973209531 - 2³ = 71953973209523 is a prime.

It is a super-2 number, since 2×71953973209531² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71953973209231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375246990 + ... + 375438691.

It is an arithmetic number, because the mean of its divisors is an integer number (10279889729308).

Almost surely, 2^{71953973209531} is an apocalyptic number.

71953973209531 is a deficient number, since it is larger than the sum of its proper divisors (10285144624933).

71953973209531 is a wasteful number, since it uses less digits than its factorization.

71953973209531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750699381.

The product of its (nonzero) digits is 48223350, while the sum is 64.

The spelling of 71953973209531 in words is "seventy-one trillion, nine hundred fifty-three billion, nine hundred seventy-three million, two hundred nine thousand, five hundred thirty-one".