66999534981120 has 416 divisors, whose sum is σ = 272218860483840. Its totient is φ = 15314178539520.

The previous prime is 66999534981091. The next prime is 66999534981139. The reversal of 66999534981120 is 2118943599966.

66999534981120 is a `hidden beast` number, since 6 + 6 + 9 + 9 + 9 + 5 + 3 + 498 + 1 + 120 = 666.

66999534981120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4783941 + ... + 12525380.

Almost surely, 2^{66999534981120} is an apocalyptic number.

66999534981120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66999534981120 is an abundant number, since it is smaller than the sum of its proper divisors (205219325502720).

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

66999534981120 is a wasteful number, since it uses less digits than its factorization.

66999534981120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17309366 (or 17309338 counting only the distinct ones).

The product of its (nonzero) digits is 226748160, while the sum is 72.

The spelling of 66999534981120 in words is "sixty-six trillion, nine hundred ninety-nine billion, five hundred thirty-four million, nine hundred eighty-one thousand, one hundred twenty".