66525520124 has 36 divisors (see below), whose sum is σ = 135456446160. Its totient is φ = 28504728000.

The previous prime is 66525520123. The next prime is 66525520169. The reversal of 66525520124 is 42102552566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66525520123) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 929624 + ... + 998624.

It is an arithmetic number, because the mean of its divisors is an integer number (3762679060).

Almost surely, 2^66525520124 is an apocalyptic number.

It is an amenable number.

66525520124 is an abundant number, since it is smaller than the sum of its proper divisors (68930926036).

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

66525520124 is a wasteful number, since it uses less digits than its factorization.

66525520124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73938 (or 73929 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 66525520124 in words is "sixty-six billion, five hundred twenty-five million, five hundred twenty thousand, one hundred twenty-four".