665774051 has 2 divisors, whose sum is σ = 665774052. Its totient is φ = 665774050.

The previous prime is 665774033. The next prime is 665774059. The reversal of 665774051 is 150477566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665774051 - 2⁶ = 665773987 is a prime.

It is not a weakly prime, because it can be changed into another prime (665774059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332887025 + 332887026.

It is an arithmetic number, because the mean of its divisors is an integer number (332887026).

Almost surely, 2^665774051 is an apocalyptic number.

665774051 is a deficient number, since it is larger than the sum of its proper divisors (1).

665774051 is an equidigital number, since it uses as much as digits as its factorization.

665774051 is an evil number, because the sum of its binary digits is even.

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

The square root of 665774051 is about 25802.5977568151. The cubic root of 665774051 is about 873.1904047932.

It can be divided in two parts, 6657 and 74051, that added together give a palindrome (80708).

The spelling of 665774051 in words is "six hundred sixty-five million, seven hundred seventy-four thousand, fifty-one".