400640346613566 has 40 divisors (see below), whose sum is σ = 903106782713520. Its totient is φ = 132747100864992.

The previous prime is 400640346613543. The next prime is 400640346613579. The reversal of 400640346613566 is 665316643046004.

400640346613566 is a `hidden beast` number, since 4 + 0 + 0 + 6 + 4 + 0 + 3 + 4 + 66 + 13 + 566 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7404429711 + ... + 7404483818.

It is an arithmetic number, because the mean of its divisors is an integer number (22577669567838).

Almost surely, 2^{400640346613566} is an apocalyptic number.

400640346613566 is an abundant number, since it is smaller than the sum of its proper divisors (502466436099954).

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

400640346613566 is a wasteful number, since it uses less digits than its factorization.

400640346613566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14808913710 (or 14808913701 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 54.

The spelling of 400640346613566 in words is "four hundred trillion, six hundred forty billion, three hundred forty-six million, six hundred thirteen thousand, five hundred sixty-six".