11513021640 has 64 divisors (see below), whose sum is σ = 35124494400. Its totient is φ = 3018100992.

The previous prime is 11513021623. The next prime is 11513021647. The reversal of 11513021640 is 4612031511.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 11513021640.

It is not an unprimeable number, because it can be changed into a prime (11513021647) 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, 805987 + ... + 820146.

It is an arithmetic number, because the mean of its divisors is an integer number (548820225).

Almost surely, 2^11513021640 is an apocalyptic number.

11513021640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11513021640 is an abundant number, since it is smaller than the sum of its proper divisors (23611472760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11513021640 is a wasteful number, since it uses less digits than its factorization.

11513021640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626206 (or 1626202 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The spelling of 11513021640 in words is "eleven billion, five hundred thirteen million, twenty-one thousand, six hundred forty".