665041631434 has 4 divisors (see below), whose sum is σ = 997562447154. Its totient is φ = 332520815716.

The previous prime is 665041631383. The next prime is 665041631497. The reversal of 665041631434 is 434136140566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434136140566 = 2 ⋅217068070283.

It can be written as a sum of positive squares in only one way, i.e., 647868839409 + 17172792025 = 804903^2 + 131045^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166260407857 + ... + 166260407860.

Almost surely, 2^665041631434 is an apocalyptic number.

665041631434 is a deficient number, since it is larger than the sum of its proper divisors (332520815720).

665041631434 is a wasteful number, since it uses less digits than its factorization.

665041631434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332520815719.

The product of its (nonzero) digits is 622080, while the sum is 43.

The spelling of 665041631434 in words is "six hundred sixty-five billion, forty-one million, six hundred thirty-one thousand, four hundred thirty-four".