66680565402 has 16 divisors (see below), whose sum is σ = 145484870112. Its totient is φ = 20206231920.

The previous prime is 66680565401. The next prime is 66680565431. The reversal of 66680565402 is 20456508666.

It is not an unprimeable number, because it can be changed into a prime (66680565401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505155733 + ... + 505155864.

It is an arithmetic number, because the mean of its divisors is an integer number (9092804382).

Almost surely, 2^66680565402 is an apocalyptic number.

66680565402 is an abundant number, since it is smaller than the sum of its proper divisors (78804304710).

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

66680565402 is a wasteful number, since it uses less digits than its factorization.

66680565402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010311613.

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 66680565402 in words is "sixty-six billion, six hundred eighty million, five hundred sixty-five thousand, four hundred two".