40640346621 has 48 divisors (see below), whose sum is σ = 70997376000. Its totient is φ = 22904876736.

The previous prime is 40640346599. The next prime is 40640346641. The reversal of 40640346621 is 12664304604.

40640346621 is a `hidden beast` number, since 4 + 0 + 640 + 3 + 4 + 6 + 6 + 2 + 1 = 666.

It is not a de Polignac number, because 40640346621 - 2⁵ = 40640346589 is a prime.

It is a super-2 number, since 2×40640346621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640346641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 113821 + ... + 306978.

It is an arithmetic number, because the mean of its divisors is an integer number (1479112000).

Almost surely, 2^40640346621 is an apocalyptic number.

It is an amenable number.

40640346621 is a deficient number, since it is larger than the sum of its proper divisors (30357029379).

40640346621 is a wasteful number, since it uses less digits than its factorization.

40640346621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420895 (or 420882 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 40640346621 in words is "forty billion, six hundred forty million, three hundred forty-six thousand, six hundred twenty-one".