64861854385400 has 48 divisors (see below), whose sum is σ = 155668450539840. Its totient is φ = 25107814598400.

The previous prime is 64861854385399. The next prime is 64861854385453. The reversal of 64861854385400 is 458345816846.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5230788509 + ... + 5230800908.

It is an arithmetic number, because the mean of its divisors is an integer number (3243092719580).

Almost surely, 2^{64861854385400} is an apocalyptic number.

It is an amenable number.

64861854385400 is an abundant number, since it is smaller than the sum of its proper divisors (90806596154440).

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

64861854385400 is a wasteful number, since it uses less digits than its factorization.

64861854385400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10461589464 (or 10461589455 counting only the distinct ones).

The product of its (nonzero) digits is 88473600, while the sum is 62.

The spelling of 64861854385400 in words is "sixty-four trillion, eight hundred sixty-one billion, eight hundred fifty-four million, three hundred eighty-five thousand, four hundred".