11662131621 has 16 divisors (see below), whose sum is σ = 17831528064. Its totient is φ = 6641327424.

The previous prime is 11662131599. The next prime is 11662131647. The reversal of 11662131621 is 12613126611.

It is a happy number.

It is not a de Polignac number, because 11662131621 - 2⁵ = 11662131589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11662131661) 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, 941526 + ... + 953831.

It is an arithmetic number, because the mean of its divisors is an integer number (1114470504).

Almost surely, 2^11662131621 is an apocalyptic number.

It is an amenable number.

11662131621 is a deficient number, since it is larger than the sum of its proper divisors (6169396443).

11662131621 is a wasteful number, since it uses less digits than its factorization.

11662131621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1895660.

The product of its digits is 2592, while the sum is 30.

The spelling of 11662131621 in words is "eleven billion, six hundred sixty-two million, one hundred thirty-one thousand, six hundred twenty-one".