66413570724 has 36 divisors (see below), whose sum is σ = 167891478300. Its totient is φ = 22136178240.

The previous prime is 66413570723. The next prime is 66413570737. The reversal of 66413570724 is 42707531466.

66413570724 is a `hidden beast` number, since 6 + 6 + 4 + 1 + 3 + 570 + 72 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49092378624 + 17321192100 = 221568^2 + 131610^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 66413570724.

It is not an unprimeable number, because it can be changed into a prime (66413570723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 468102 + ... + 593250.

It is an arithmetic number, because the mean of its divisors is an integer number (4663652175).

Almost surely, 2^66413570724 is an apocalyptic number.

It is an amenable number.

66413570724 is an abundant number, since it is smaller than the sum of its proper divisors (101477907576).

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

66413570724 is a wasteful number, since it uses less digits than its factorization.

66413570724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139900 (or 139895 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 66413570724 in words is "sixty-six billion, four hundred thirteen million, five hundred seventy thousand, seven hundred twenty-four".