665146601 has 4 divisors (see below), whose sum is σ = 760167552. Its totient is φ = 570125652.

The previous prime is 665146543. The next prime is 665146609. The reversal of 665146601 is 106641566.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665146601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665146609) 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, 47510465 + ... + 47510478.

It is an arithmetic number, because the mean of its divisors is an integer number (190041888).

Almost surely, 2^665146601 is an apocalyptic number.

It is an amenable number.

665146601 is a deficient number, since it is larger than the sum of its proper divisors (95020951).

665146601 is an equidigital number, since it uses as much as digits as its factorization.

665146601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95020950.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 665146601 is about 25790.4362312854. The cubic root of 665146601 is about 872.9160096367.

The spelling of 665146601 in words is "six hundred sixty-five million, one hundred forty-six thousand, six hundred one".