40636413581 has 8 divisors (see below), whose sum is σ = 42012726528. Its totient is φ = 39264192000.

The previous prime is 40636413569. The next prime is 40636413611. The reversal of 40636413581 is 18531463604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40636413581 is a prime.

It is a super-2 number, since 2×40636413581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40636413511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1002635 + ... + 1042376.

It is an arithmetic number, because the mean of its divisors is an integer number (5251590816).

Almost surely, 2^40636413581 is an apocalyptic number.

It is an amenable number.

40636413581 is a deficient number, since it is larger than the sum of its proper divisors (1376312947).

40636413581 is a wasteful number, since it uses less digits than its factorization.

40636413581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045683.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 40636413581 in words is "forty billion, six hundred thirty-six million, four hundred thirteen thousand, five hundred eighty-one".