680202166557 has 4 divisors (see below), whose sum is σ = 906936222080. Its totient is φ = 453468111036.

The previous prime is 680202166547. The next prime is 680202166577. The reversal of 680202166557 is 755661202086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 680202166557 - 2¹⁵ = 680202133789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680202166537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113367027757 + ... + 113367027762.

It is an arithmetic number, because the mean of its divisors is an integer number (226734055520).

Almost surely, 2^680202166557 is an apocalyptic number.

It is an amenable number.

680202166557 is a deficient number, since it is larger than the sum of its proper divisors (226734055523).

680202166557 is a wasteful number, since it uses less digits than its factorization.

680202166557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226734055522.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 680202166557 in words is "six hundred eighty billion, two hundred two million, one hundred sixty-six thousand, five hundred fifty-seven".