665661350 has 24 divisors (see below), whose sum is σ = 1310962968. Its totient is φ = 250601600.

The previous prime is 665661343. The next prime is 665661379. The reversal of 665661350 is 53166566.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390716 + ... + 392415.

It is an arithmetic number, because the mean of its divisors is an integer number (54623457).

Almost surely, 2^665661350 is an apocalyptic number.

665661350 is a deficient number, since it is larger than the sum of its proper divisors (645301618).

665661350 is a wasteful number, since it uses less digits than its factorization.

665661350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783160 (or 783155 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 665661350 is about 25800.4137563722. The cubic root of 665661350 is about 873.1411313272.

The spelling of 665661350 in words is "six hundred sixty-five million, six hundred sixty-one thousand, three hundred fifty".