660855478 has 16 divisors (see below), whose sum is σ = 996396480. Its totient is φ = 328728456.

The previous prime is 660855469. The next prime is 660855491. The reversal of 660855478 is 874558066.

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, 395601 + ... + 397267.

It is an arithmetic number, because the mean of its divisors is an integer number (62274780).

Almost surely, 2^660855478 is an apocalyptic number.

660855478 is a deficient number, since it is larger than the sum of its proper divisors (335541002).

660855478 is a wasteful number, since it uses less digits than its factorization.

660855478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The square root of 660855478 is about 25707.1094835650. The cubic root of 660855478 is about 871.0347831796.

The spelling of 660855478 in words is "six hundred sixty million, eight hundred fifty-five thousand, four hundred seventy-eight".