64978898722902 has 64 divisors (see below), whose sum is σ = 145358062080000. Its totient is φ = 21515564865600.

The previous prime is 64978898722901. The next prime is 64978898722951. The reversal of 64978898722902 is 20922789887946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64978898722901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 341451474 + ... + 341641722.

It is an arithmetic number, because the mean of its divisors is an integer number (2271219720000).

Almost surely, 2^{64978898722902} is an apocalyptic number.

64978898722902 is an abundant number, since it is smaller than the sum of its proper divisors (80379163357098).

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

64978898722902 is a wasteful number, since it uses less digits than its factorization.

64978898722902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232298 (or 232292 counting only the distinct ones).

The product of its (nonzero) digits is 3511517184, while the sum is 81.

The spelling of 64978898722902 in words is "sixty-four trillion, nine hundred seventy-eight billion, eight hundred ninety-eight million, seven hundred twenty-two thousand, nine hundred two".