680188505 has 16 divisors (see below), whose sum is σ = 865966080. Its totient is φ = 511443072.

The previous prime is 680188493. The next prime is 680188507. The reversal of 680188505 is 505881086.

It is a cyclic number.

It is not a de Polignac number, because 680188505 - 2¹² = 680184409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (680188507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16124 + ... + 40253.

It is an arithmetic number, because the mean of its divisors is an integer number (54122880).

Almost surely, 2^680188505 is an apocalyptic number.

It is an amenable number.

680188505 is a deficient number, since it is larger than the sum of its proper divisors (185777575).

680188505 is a wasteful number, since it uses less digits than its factorization.

680188505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56528.

The product of its (nonzero) digits is 76800, while the sum is 41.

The square root of 680188505 is about 26080.4237887347. The cubic root of 680188505 is about 879.4471842162.

The spelling of 680188505 in words is "six hundred eighty million, one hundred eighty-eight thousand, five hundred five".