64773168780 has 96 divisors (see below), whose sum is σ = 186117523200. Its totient is φ = 16824907008.

The previous prime is 64773168773. The next prime is 64773168787. The reversal of 64773168780 is 8786137746.

It is an interprime number because it is at equal distance from previous prime (64773168773) and next prime (64773168787).

It is a self number, because there is not a number n which added to its sum of digits gives 64773168780.

It is not an unprimeable number, because it can be changed into a prime (64773168787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368751 + ... + 515289.

It is an arithmetic number, because the mean of its divisors is an integer number (1938724200).

Almost surely, 2^64773168780 is an apocalyptic number.

64773168780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64773168780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93058761600).

64773168780 is an abundant number, since it is smaller than the sum of its proper divisors (121344354420).

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

64773168780 is a wasteful number, since it uses less digits than its factorization.

64773168780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146743 (or 146741 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 57.

The spelling of 64773168780 in words is "sixty-four billion, seven hundred seventy-three million, one hundred sixty-eight thousand, seven hundred eighty".