660855477 has 4 divisors (see below), whose sum is σ = 881140640. Its totient is φ = 440570316.

The previous prime is 660855469. The next prime is 660855491. The reversal of 660855477 is 774558066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 660855477 - 2³ = 660855469 is a prime.

It is a super-2 number, since 2×660855477² = 873459922961795058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660855077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110142577 + ... + 110142582.

It is an arithmetic number, because the mean of its divisors is an integer number (220285160).

Almost surely, 2^660855477 is an apocalyptic number.

It is an amenable number.

660855477 is a deficient number, since it is larger than the sum of its proper divisors (220285163).

660855477 is a wasteful number, since it uses less digits than its factorization.

660855477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220285162.

The product of its (nonzero) digits is 1411200, while the sum is 48.

The square root of 660855477 is about 25707.1094641152. The cubic root of 660855477 is about 871.0347827403.

The spelling of 660855477 in words is "six hundred sixty million, eight hundred fifty-five thousand, four hundred seventy-seven".