660620353 has 4 divisors (see below), whose sum is σ = 660676608. Its totient is φ = 660564100.

The previous prime is 660620341. The next prime is 660620371. The reversal of 660620353 is 353026066.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660620353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660620453) 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, 3073 + ... + 36478.

It is an arithmetic number, because the mean of its divisors is an integer number (165169152).

Almost surely, 2^660620353 is an apocalyptic number.

It is an amenable number.

660620353 is a deficient number, since it is larger than the sum of its proper divisors (56255).

660620353 is a wasteful number, since it uses less digits than its factorization.

660620353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56254.

The product of its (nonzero) digits is 19440, while the sum is 31.

The square root of 660620353 is about 25702.5359254685. The cubic root of 660620353 is about 870.9314694427.

The spelling of 660620353 in words is "six hundred sixty million, six hundred twenty thousand, three hundred fifty-three".