64815001957040 has 40 divisors (see below), whose sum is σ = 150712553808960. Its totient is φ = 25922960050176.

The previous prime is 64815001957039. The next prime is 64815001957051. The reversal of 64815001957040 is 4075910051846.

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

It is a self number, because there is not a number n which added to its sum of digits gives 64815001957040.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46825025 + ... + 48189344.

It is an arithmetic number, because the mean of its divisors is an integer number (3767813845224).

Almost surely, 2^{64815001957040} is an apocalyptic number.

It is an amenable number.

64815001957040 is an abundant number, since it is smaller than the sum of its proper divisors (85897551851920).

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

64815001957040 is a wasteful number, since it uses less digits than its factorization.

64815001957040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95022909 (or 95022903 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 64815001957040 in words is "sixty-four trillion, eight hundred fifteen billion, one million, nine hundred fifty-seven thousand, forty".