64777485265920 has 4928 divisors, whose sum is σ = 300633930362880. Its totient is φ = 13045453553664.

The previous prime is 64777485265919. The next prime is 64777485265951. The reversal of 64777485265920 is 2956258477746.

64777485265920 is a `hidden beast` number, since 6 + 4 + 7 + 7 + 7 + 4 + 8 + 5 + 26 + 592 + 0 = 666.

It is a super-2 number, since 2×64777485265920² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 447 ways as a sum of consecutive naturals, for example, 605397058507 + ... + 605397058613.

Almost surely, 2^{64777485265920} is an apocalyptic number.

64777485265920 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 64777485265920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150316965181440).

64777485265920 is an abundant number, since it is smaller than the sum of its proper divisors (235856445096960).

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

64777485265920 is a wasteful number, since it uses less digits than its factorization.

64777485265920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 1422489600, while the sum is 72.

The spelling of 64777485265920 in words is "sixty-four trillion, seven hundred seventy-seven billion, four hundred eighty-five million, two hundred sixty-five thousand, nine hundred twenty".