660057221507 has 4 divisors (see below), whose sum is σ = 669908821896. Its totient is φ = 650205621120.

The previous prime is 660057221501. The next prime is 660057221533. The reversal of 660057221507 is 705122750066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660057221507 - 2²⁰ = 660056172931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660057221501) 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, 4925800094 + ... + 4925800227.

It is an arithmetic number, because the mean of its divisors is an integer number (167477205474).

Almost surely, 2^660057221507 is an apocalyptic number.

660057221507 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

660057221507 is a deficient number, since it is larger than the sum of its proper divisors (9851600389).

660057221507 is an equidigital number, since it uses as much as digits as its factorization.

660057221507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9851600388.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 660057221507 in words is "six hundred sixty billion, fifty-seven million, two hundred twenty-one thousand, five hundred seven".