665372801 has 2 divisors, whose sum is σ = 665372802. Its totient is φ = 665372800.

The previous prime is 665372797. The next prime is 665372849. The reversal of 665372801 is 108273566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 441840400 + 223532401 = 21020^2 + 14951^2 .

It is a cyclic number.

It is not a de Polignac number, because 665372801 - 2² = 665372797 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665372501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332686400 + 332686401.

It is an arithmetic number, because the mean of its divisors is an integer number (332686401).

Almost surely, 2^665372801 is an apocalyptic number.

It is an amenable number.

665372801 is a deficient number, since it is larger than the sum of its proper divisors (1).

665372801 is an equidigital number, since it uses as much as digits as its factorization.

665372801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 665372801 is about 25794.8212050404. The cubic root of 665372801 is about 873.0149508437.

The spelling of 665372801 in words is "six hundred sixty-five million, three hundred seventy-two thousand, eight hundred one".