665403461 has 2 divisors, whose sum is σ = 665403462. Its totient is φ = 665403460.

The previous prime is 665403407. The next prime is 665403469. The reversal of 665403461 is 164304566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493950625 + 171452836 = 22225^2 + 13094^2 .

It is a cyclic number.

It is not a de Polignac number, because 665403461 - 2⁶ = 665403397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665403469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332701730 + 332701731.

It is an arithmetic number, because the mean of its divisors is an integer number (332701731).

Almost surely, 2^665403461 is an apocalyptic number.

It is an amenable number.

665403461 is a deficient number, since it is larger than the sum of its proper divisors (1).

665403461 is an equidigital number, since it uses as much as digits as its factorization.

665403461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 665403461 is about 25795.4155035347. The cubic root of 665403461 is about 873.0283599817.

The spelling of 665403461 in words is "six hundred sixty-five million, four hundred three thousand, four hundred sixty-one".