665376406 has 16 divisors (see below), whose sum is σ = 1033280640. Its totient is φ = 320967360.

The previous prime is 665376403. The next prime is 665376419. The reversal of 665376406 is 604673566.

It is a super-2 number, since 2×665376406² = 885451523322953672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665376401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87226 + ... + 94546.

It is an arithmetic number, because the mean of its divisors is an integer number (64580040).

Almost surely, 2^665376406 is an apocalyptic number.

665376406 is a deficient number, since it is larger than the sum of its proper divisors (367904234).

665376406 is a wasteful number, since it uses less digits than its factorization.

665376406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8919.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 665376406 is about 25794.8910833134. The cubic root of 665376406 is about 873.0165275103.

The spelling of 665376406 in words is "six hundred sixty-five million, three hundred seventy-six thousand, four hundred six".