65555942400 has 792 divisors, whose sum is σ = 259163464560. Its totient is φ = 15730606080.

The previous prime is 65555942381. The next prime is 65555942411. The reversal of 65555942400 is 424955556.

65555942400 is a `hidden beast` number, since 6 + 5 + 55 + 594 + 2 + 4 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 128793346 + ... + 128793854.

Almost surely, 2^65555942400 is an apocalyptic number.

65555942400 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 65555942400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129581732280).

65555942400 is an abundant number, since it is smaller than the sum of its proper divisors (193607522160).

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

65555942400 is a wasteful number, since it uses less digits than its factorization.

65555942400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 65555942400 in words is "sixty-five billion, five hundred fifty-five million, nine hundred forty-two thousand, four hundred".