40251017538 has 96 divisors (see below), whose sum is σ = 96419756160. Its totient is φ = 12078097920.

The previous prime is 40251017507. The next prime is 40251017549. The reversal of 40251017538 is 83571015204.

40251017538 is a `hidden beast` number, since 40 + 2 + 510 + 1 + 75 + 38 = 666.

It is a Curzon number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 928323 + ... + 970713.

It is an arithmetic number, because the mean of its divisors is an integer number (1004372460).

Almost surely, 2^40251017538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40251017538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48209878080).

40251017538 is an abundant number, since it is smaller than the sum of its proper divisors (56168738622).

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

40251017538 is a wasteful number, since it uses less digits than its factorization.

40251017538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42552 (or 42549 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 40251017538 in words is "forty billion, two hundred fifty-one million, seventeen thousand, five hundred thirty-eight".