680521557 has 8 divisors (see below), whose sum is σ = 909430720. Its totient is φ = 452646720.

The previous prime is 680521547. The next prime is 680521559. The reversal of 680521557 is 755125086.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 680521557 - 2²³ = 672132949 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 (680521559) 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, 257044 + ... + 259677.

It is an arithmetic number, because the mean of its divisors is an integer number (113678840).

Almost surely, 2^680521557 is an apocalyptic number.

It is an amenable number.

680521557 is a deficient number, since it is larger than the sum of its proper divisors (228909163).

680521557 is a wasteful number, since it uses less digits than its factorization.

680521557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517163.

The product of its (nonzero) digits is 84000, while the sum is 39.

The square root of 680521557 is about 26086.8081029474. The cubic root of 680521557 is about 879.5907002407.

The spelling of 680521557 in words is "six hundred eighty million, five hundred twenty-one thousand, five hundred fifty-seven".