11661212521522 has 8 divisors (see below), whose sum is σ = 17491856624172. Its totient is φ = 5830593646800.

The previous prime is 11661212521507. The next prime is 11661212521537. The reversal of 11661212521522 is 22512521216611.

It is an interprime number because it is at equal distance from previous prime (11661212521507) and next prime (11661212521537).

It can be written as a sum of positive squares in 2 ways, for example, as 11644275841641 + 16936679881 = 3412371^2 + 130141^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5105629 + ... + 7027792.

Almost surely, 2^{11661212521522} is an apocalyptic number.

11661212521522 is a deficient number, since it is larger than the sum of its proper divisors (5830644102650).

11661212521522 is a wasteful number, since it uses less digits than its factorization.

11661212521522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12613964.

The product of its digits is 28800, while the sum is 37.

The spelling of 11661212521522 in words is "eleven trillion, six hundred sixty-one billion, two hundred twelve million, five hundred twenty-one thousand, five hundred twenty-two".