32166991491 has 16 divisors (see below), whose sum is σ = 43150694304. Its totient is φ = 21314052864.

The previous prime is 32166991463. The next prime is 32166991499. The reversal of 32166991491 is 19419966123.

It is not a de Polignac number, because 32166991491 - 2¹⁵ = 32166958723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (32166991499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2097945 + ... + 2113221.

It is an arithmetic number, because the mean of its divisors is an integer number (2696918394).

Almost surely, 2^32166991491 is an apocalyptic number.

32166991491 is a deficient number, since it is larger than the sum of its proper divisors (10983702813).

32166991491 is a wasteful number, since it uses less digits than its factorization.

32166991491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19510.

The product of its digits is 629856, while the sum is 51.

The spelling of 32166991491 in words is "thirty-two billion, one hundred sixty-six million, nine hundred ninety-one thousand, four hundred ninety-one".