665710054 has 4 divisors (see below), whose sum is σ = 998565084. Its totient is φ = 332855026.

The previous prime is 665710043. The next prime is 665710061. The reversal of 665710054 is 450017566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166427512 + ... + 166427515.

It is an arithmetic number, because the mean of its divisors is an integer number (249641271).

Almost surely, 2^665710054 is an apocalyptic number.

665710054 is a deficient number, since it is larger than the sum of its proper divisors (332855030).

665710054 is a wasteful number, since it uses less digits than its factorization.

665710054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332855029.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 665710054 is about 25801.3575999404. The cubic root of 665710054 is about 873.1624256528.

The spelling of 665710054 in words is "six hundred sixty-five million, seven hundred ten thousand, fifty-four".