40181772636 has 36 divisors (see below), whose sum is σ = 101842933192. Its totient is φ = 13358011104.

The previous prime is 40181772629. The next prime is 40181772637. The reversal of 40181772636 is 63627718104.

40181772636 is a `hidden beast` number, since 4 + 0 + 1 + 8 + 1 + 7 + 7 + 2 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×40181772636² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40181772591 and 40181772600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40181772637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1482766 + ... + 1509621.

Almost surely, 2^40181772636 is an apocalyptic number.

It is an amenable number.

40181772636 is an abundant number, since it is smaller than the sum of its proper divisors (61661160556).

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

40181772636 is a wasteful number, since it uses less digits than its factorization.

40181772636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992770 (or 2992765 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 40181772636 in words is "forty billion, one hundred eighty-one million, seven hundred seventy-two thousand, six hundred thirty-six".