11632642781 has 8 divisors (see below), whose sum is σ = 11763094104. Its totient is φ = 11502491200.

The previous prime is 11632642757. The next prime is 11632642789. The reversal of 11632642781 is 18724623611.

It can be written as a sum of positive squares in 4 ways, for example, as 6109923556 + 5522719225 = 78166^2 + 74315^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11632642781 is a prime.

It is a super-2 number, since 2×11632642781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11632642789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3575 + ... + 152571.

It is an arithmetic number, because the mean of its divisors is an integer number (1470386763).

Almost surely, 2^11632642781 is an apocalyptic number.

It is an amenable number.

11632642781 is a deficient number, since it is larger than the sum of its proper divisors (130451323).

11632642781 is a wasteful number, since it uses less digits than its factorization.

11632642781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149871.

The product of its digits is 96768, while the sum is 41.

The spelling of 11632642781 in words is "eleven billion, six hundred thirty-two million, six hundred forty-two thousand, seven hundred eighty-one".