11618137620 has 72 divisors (see below), whose sum is σ = 37314734184. Its totient is φ = 2915923968.

The previous prime is 11618137549. The next prime is 11618137627. The reversal of 11618137620 is 2673181611.

11618137620 is a `hidden beast` number, since 1 + 1 + 6 + 18 + 13 + 7 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1450238724 + 10167898896 = 38082^2 + 100836^2 .

It is a super-2 number, since 2×11618137620² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11618137627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1895329 + ... + 1901448.

It is an arithmetic number, because the mean of its divisors is an integer number (518260197).

Almost surely, 2^11618137620 is an apocalyptic number.

11618137620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11618137620 is an abundant number, since it is smaller than the sum of its proper divisors (25696596564).

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

11618137620 is a wasteful number, since it uses less digits than its factorization.

11618137620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796809 (or 3796804 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 11618137620 in words is "eleven billion, six hundred eighteen million, one hundred thirty-seven thousand, six hundred twenty".