64645974347278 has 16 divisors (see below), whose sum is σ = 97879375251504. Its totient is φ = 32019541620160.

The previous prime is 64645974347267. The next prime is 64645974347369. The reversal of 64645974347278 is 87274347954646.

It is a congruent number.

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, 1368625 + ... + 11452732.

It is an arithmetic number, because the mean of its divisors is an integer number (6117460953219).

Almost surely, 2^{64645974347278} is an apocalyptic number.

64645974347278 is a deficient number, since it is larger than the sum of its proper divisors (33233400904226).

64645974347278 is a wasteful number, since it uses less digits than its factorization.

64645974347278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12845027.

The product of its digits is 6827950080, while the sum is 76.

The spelling of 64645974347278 in words is "sixty-four trillion, six hundred forty-five billion, nine hundred seventy-four million, three hundred forty-seven thousand, two hundred seventy-eight".