11621218765 has 16 divisors (see below), whose sum is σ = 15208300800. Its totient is φ = 8473188672.

The previous prime is 11621218753. The next prime is 11621218771. The reversal of 11621218765 is 56781212611.

It is a de Polignac number, because none of the positive numbers 2^k-11621218765 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1126435 + ... + 1136704.

It is an arithmetic number, because the mean of its divisors is an integer number (950518800).

Almost surely, 2^11621218765 is an apocalyptic number.

It is an amenable number.

11621218765 is a deficient number, since it is larger than the sum of its proper divisors (3587082035).

11621218765 is a wasteful number, since it uses less digits than its factorization.

11621218765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263236.

The product of its digits is 40320, while the sum is 40.

The spelling of 11621218765 in words is "eleven billion, six hundred twenty-one million, two hundred eighteen thousand, seven hundred sixty-five".