64994240857215 has 64 divisors (see below), whose sum is σ = 107110144512000. Its totient is φ = 33639637824000.

The previous prime is 64994240857163. The next prime is 64994240857223. The reversal of 64994240857215 is 51275804249946.

It is not a de Polignac number, because 64994240857215 - 2¹² = 64994240853119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 100805365 + ... + 101448065.

It is an arithmetic number, because the mean of its divisors is an integer number (1673596008000).

Almost surely, 2^{64994240857215} is an apocalyptic number.

64994240857215 is a deficient number, since it is larger than the sum of its proper divisors (42115903654785).

64994240857215 is a wasteful number, since it uses less digits than its factorization.

64994240857215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644248.

The product of its (nonzero) digits is 174182400, while the sum is 66.

The spelling of 64994240857215 in words is "sixty-four trillion, nine hundred ninety-four billion, two hundred forty million, eight hundred fifty-seven thousand, two hundred fifteen".