63366165565920 has 576 divisors, whose sum is σ = 256315905570816. Its totient is φ = 14481718824960.

The previous prime is 63366165565907. The next prime is 63366165565961. The reversal of 63366165565920 is 2956556166336.

63366165565920 is a `hidden beast` number, since 6 + 3 + 3 + 6 + 6 + 1 + 6 + 556 + 59 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3121937212 + ... + 3121957508.

It is an arithmetic number, because the mean of its divisors is an integer number (444992891616).

Almost surely, 2^{63366165565920} is an apocalyptic number.

63366165565920 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 63366165565920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128157952785408).

63366165565920 is an abundant number, since it is smaller than the sum of its proper divisors (192949740004896).

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

63366165565920 is a wasteful number, since it uses less digits than its factorization.

63366165565920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31805 (or 31785 counting only the distinct ones).

The product of its (nonzero) digits is 157464000, while the sum is 63.

The spelling of 63366165565920 in words is "sixty-three trillion, three hundred sixty-six billion, one hundred sixty-five million, five hundred sixty-five thousand, nine hundred twenty".