40137678736521 has 16 divisors (see below), whose sum is σ = 53813704439040. Its totient is φ = 26610058949760.

The previous prime is 40137678736513. The next prime is 40137678736549. The reversal of 40137678736521 is 12563787673104.

It is not a de Polignac number, because 40137678736521 - 2³ = 40137678736513 is a prime.

It is a super-2 number, since 2×40137678736521² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40137678736511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26058736 + ... + 27555998.

It is an arithmetic number, because the mean of its divisors is an integer number (3363356527440).

Almost surely, 2^{40137678736521} is an apocalyptic number.

It is an amenable number.

40137678736521 is a deficient number, since it is larger than the sum of its proper divisors (13676025702519).

40137678736521 is a wasteful number, since it uses less digits than its factorization.

40137678736521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546816.

The product of its (nonzero) digits is 35562240, while the sum is 60.

The spelling of 40137678736521 in words is "forty trillion, one hundred thirty-seven billion, six hundred seventy-eight million, seven hundred thirty-six thousand, five hundred twenty-one".