660780457 has 8 divisors (see below), whose sum is σ = 693195840. Its totient is φ = 629007120.

The previous prime is 660780431. The next prime is 660780467. The reversal of 660780457 is 754087066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660780457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660780427) 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, 158403 + ... + 162520.

It is an arithmetic number, because the mean of its divisors is an integer number (86649480).

Almost surely, 2^660780457 is an apocalyptic number.

It is an amenable number.

660780457 is a deficient number, since it is larger than the sum of its proper divisors (32415383).

660780457 is a wasteful number, since it uses less digits than its factorization.

660780457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321023.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 660780457 is about 25705.6502932721. The cubic root of 660780457 is about 871.0018216747.

The spelling of 660780457 in words is "six hundred sixty million, seven hundred eighty thousand, four hundred fifty-seven".