665433036544 has 72 divisors (see below), whose sum is σ = 1393592332160. Its totient is φ = 316705075200.

The previous prime is 665433036517. The next prime is 665433036551. The reversal of 665433036544 is 445630334566.

665433036544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×665433036544² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203199 + ... + 1171390.

Almost surely, 2^665433036544 is an apocalyptic number.

665433036544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

665433036544 is an abundant number, since it is smaller than the sum of its proper divisors (728159295616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665433036544 is a wasteful number, since it uses less digits than its factorization.

665433036544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374697 (or 1374683 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 49.

The spelling of 665433036544 in words is "six hundred sixty-five billion, four hundred thirty-three million, thirty-six thousand, five hundred forty-four".