40521856578648 has 64 divisors (see below), whose sum is σ = 102205633096800. Its totient is φ = 13387163811840.

The previous prime is 40521856578629. The next prime is 40521856578677. The reversal of 40521856578648 is 84687565812504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63711168 + ... + 64344048.

Almost surely, 2^{40521856578648} is an apocalyptic number.

It is an amenable number.

40521856578648 is an abundant number, since it is smaller than the sum of its proper divisors (61683776518152).

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

40521856578648 is a wasteful number, since it uses less digits than its factorization.

40521856578648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656612 (or 656608 counting only the distinct ones).

The product of its (nonzero) digits is 516096000, while the sum is 69.

The spelling of 40521856578648 in words is "forty trillion, five hundred twenty-one billion, eight hundred fifty-six million, five hundred seventy-eight thousand, six hundred forty-eight".