36981664722 has 90 divisors (see below), whose sum is σ = 85987357599. Its totient is φ = 11879300160.

The previous prime is 36981664711. The next prime is 36981664729. The reversal of 36981664722 is 22746618963.

36981664722 is a `hidden beast` number, since 3 + 6 + 9 + 8 + 166 + 472 + 2 = 666.

36981664722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 11429961921 + 25551702801 = 106911^2 + 159849^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=135981.

It is a super-2 number, since 2×36981664722² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (36981664729) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 70981822 + ... + 70982342.

Almost surely, 2^36981664722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 36981664722

36981664722 is an abundant number, since it is smaller than the sum of its proper divisors (49005692877).

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

36981664722 is an frugal number, since it uses more digits than its factorization.

36981664722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 555 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 36981664722 in words is "thirty-six billion, nine hundred eighty-one million, six hundred sixty-four thousand, seven hundred twenty-two".