40682991591 has 72 divisors (see below), whose sum is σ = 67314396240. Its totient is φ = 23629858560.

The previous prime is 40682991571. The next prime is 40682991611. The reversal of 40682991591 is 19519928604.

40682991591 is a `hidden beast` number, since 40 + 6 + 8 + 2 + 9 + 9 + 1 + 591 = 666.

It is an interprime number because it is at equal distance from previous prime (40682991571) and next prime (40682991611).

It is not a de Polignac number, because 40682991591 - 2⁶ = 40682991527 is a prime.

It is a super-2 number, since 2×40682991591² (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 (40682991541) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4321896 + ... + 4331298.

It is an arithmetic number, because the mean of its divisors is an integer number (934922170).

Almost surely, 2^40682991591 is an apocalyptic number.

40682991591 is a deficient number, since it is larger than the sum of its proper divisors (26631404649).

40682991591 is a wasteful number, since it uses less digits than its factorization.

40682991591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9597 (or 9583 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 40682991591 in words is "forty billion, six hundred eighty-two million, nine hundred ninety-one thousand, five hundred ninety-one".