64943207920 has 40 divisors (see below), whose sum is σ = 151006674240. Its totient is φ = 25974923520.

The previous prime is 64943207909. The next prime is 64943207957. The reversal of 64943207920 is 2970234946.

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

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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, 1047385 + ... + 1107655.

It is an arithmetic number, because the mean of its divisors is an integer number (3775166856).

Almost surely, 2^64943207920 is an apocalyptic number.

It is an amenable number.

64943207920 is an abundant number, since it is smaller than the sum of its proper divisors (86063466320).

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

64943207920 is a wasteful number, since it uses less digits than its factorization.

64943207920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73753 (or 73747 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 64943207920 in words is "sixty-four billion, nine hundred forty-three million, two hundred seven thousand, nine hundred twenty".