11636221501 has 16 divisors (see below), whose sum is σ = 12027962160. Its totient is φ = 11248796160.

The previous prime is 11636221483. The next prime is 11636221517. The reversal of 11636221501 is 10512263611.

It can be written as a sum of positive squares in 8 ways, for example, as 3534421401 + 8101800100 = 59451^2 + 90010^2 .

It is a cyclic number.

It is not a de Polignac number, because 11636221501 - 2²³ = 11627832893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11636221501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11636221561) 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, 4188825 + ... + 4191601.

It is an arithmetic number, because the mean of its divisors is an integer number (751747635).

Almost surely, 2^11636221501 is an apocalyptic number.

It is an amenable number.

11636221501 is a deficient number, since it is larger than the sum of its proper divisors (391740659).

11636221501 is a wasteful number, since it uses less digits than its factorization.

11636221501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3504.

The product of its (nonzero) digits is 2160, while the sum is 28.

The spelling of 11636221501 in words is "eleven billion, six hundred thirty-six million, two hundred twenty-one thousand, five hundred one".