40128737621 has 12 divisors (see below), whose sum is σ = 46695197088. Its totient is φ = 34385134392.

The previous prime is 40128737611. The next prime is 40128737669. The reversal of 40128737621 is 12673782104.

It is a de Polignac number, because none of the positive numbers 2^k-40128737621 is a prime.

It is a super-2 number, since 2×40128737621² (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 (40128737611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27680 + ... + 284646.

It is an arithmetic number, because the mean of its divisors is an integer number (3891266424).

Almost surely, 2^40128737621 is an apocalyptic number.

It is an amenable number.

40128737621 is a deficient number, since it is larger than the sum of its proper divisors (6566459467).

40128737621 is a wasteful number, since it uses less digits than its factorization.

40128737621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260168 (or 260161 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 40128737621 in words is "forty billion, one hundred twenty-eight million, seven hundred thirty-seven thousand, six hundred twenty-one".