665411778364 has 24 divisors (see below), whose sum is σ = 1194882893568. Its totient is φ = 324083765040.

The previous prime is 665411778359. The next prime is 665411778397. The reversal of 665411778364 is 463877114566.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 665411778299 and 665411778308.

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, 8347594 + ... + 8426929.

It is an arithmetic number, because the mean of its divisors is an integer number (49786787232).

Almost surely, 2^665411778364 is an apocalyptic number.

It is an amenable number.

665411778364 is a deficient number, since it is larger than the sum of its proper divisors (529471115204).

665411778364 is a wasteful number, since it uses less digits than its factorization.

665411778364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16774785 (or 16774783 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 58.

The spelling of 665411778364 in words is "six hundred sixty-five billion, four hundred eleven million, seven hundred seventy-eight thousand, three hundred sixty-four".