40181772591 has 12 divisors (see below), whose sum is σ = 58603837968. Its totient is φ = 26527771584.

The previous prime is 40181772569. The next prime is 40181772613. The reversal of 40181772591 is 19527718104.

It is a happy number.

40181772591 is a `hidden beast` number, since 40 + 1 + 8 + 17 + 7 + 2 + 591 = 666.

It is an interprime number because it is at equal distance from previous prime (40181772569) and next prime (40181772613).

It is not a de Polignac number, because 40181772591 - 2⁵ = 40181772559 is a prime.

It is a super-2 number, since 2×40181772591² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40181772391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21672090 + ... + 21673943.

It is an arithmetic number, because the mean of its divisors is an integer number (4883653164).

Almost surely, 2^40181772591 is an apocalyptic number.

40181772591 is a deficient number, since it is larger than the sum of its proper divisors (18422065377).

40181772591 is a wasteful number, since it uses less digits than its factorization.

40181772591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43346142 (or 43346139 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 40181772591 in words is "forty billion, one hundred eighty-one million, seven hundred seventy-two thousand, five hundred ninety-one".