636541403035440 has 160 divisors (see below), whose sum is σ = 2278424486499840. Its totient is φ = 143995227512832.

The previous prime is 636541403035429. The next prime is 636541403035493. The reversal of 636541403035440 is 44530304145636.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 636541403035440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1952897310 + ... + 1953223229.

It is an arithmetic number, because the mean of its divisors is an integer number (14240153040624).

Almost surely, 2^{636541403035440} is an apocalyptic number.

636541403035440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

636541403035440 is an abundant number, since it is smaller than the sum of its proper divisors (1641883083464400).

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

636541403035440 is a wasteful number, since it uses less digits than its factorization.

636541403035440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906120659 (or 3906120653 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 48.

The spelling of 636541403035440 in words is "six hundred thirty-six trillion, five hundred forty-one billion, four hundred three million, thirty-five thousand, four hundred forty".