40158955921 has 24 divisors (see below), whose sum is σ = 50760533760. Its totient is φ = 31558312800.

The previous prime is 40158955913. The next prime is 40158955939. The reversal of 40158955921 is 12955985104.

It is not a de Polignac number, because 40158955921 - 2³ = 40158955913 is a prime.

It is a super-2 number, since 2×40158955921² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (40158955021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 666870 + ... + 724591.

It is an arithmetic number, because the mean of its divisors is an integer number (2115022240).

Almost surely, 2^40158955921 is an apocalyptic number.

It is an amenable number.

40158955921 is a deficient number, since it is larger than the sum of its proper divisors (10601577839).

40158955921 is a wasteful number, since it uses less digits than its factorization.

40158955921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391525 (or 1391518 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 49.

The spelling of 40158955921 in words is "forty billion, one hundred fifty-eight million, nine hundred fifty-five thousand, nine hundred twenty-one".