40646506640 has 40 divisors (see below), whose sum is σ = 94722473088. Its totient is φ = 16220865920.

The previous prime is 40646506627. The next prime is 40646506699. The reversal of 40646506640 is 4660564604.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 554942 + ... + 623901.

Almost surely, 2^40646506640 is an apocalyptic number.

40646506640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40646506640 is an abundant number, since it is smaller than the sum of its proper divisors (54075966448).

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

40646506640 is a wasteful number, since it uses less digits than its factorization.

40646506640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179287 (or 1179281 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 40646506640 in words is "forty billion, six hundred forty-six million, five hundred six thousand, six hundred forty".