660712894 has 4 divisors (see below), whose sum is σ = 991069344. Its totient is φ = 330356446.

The previous prime is 660712849. The next prime is 660712901. The reversal of 660712894 is 498217066.

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

It is a self number, because there is not a number n which added to its sum of digits gives 660712894.

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, 165178222 + ... + 165178225.

It is an arithmetic number, because the mean of its divisors is an integer number (247767336).

Almost surely, 2^660712894 is an apocalyptic number.

660712894 is a deficient number, since it is larger than the sum of its proper divisors (330356450).

660712894 is a wasteful number, since it uses less digits than its factorization.

660712894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330356449.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 660712894 is about 25704.3360933520. The cubic root of 660712894 is about 870.9721348091.

The spelling of 660712894 in words is "six hundred sixty million, seven hundred twelve thousand, eight hundred ninety-four".