855621660 has 48 divisors (see below), whose sum is σ = 2417738400. Its totient is φ = 226070784.

The previous prime is 855621659. The next prime is 855621671. The reversal of 855621660 is 66126558.

It is a super-2 number, since 2×855621660² = 1464176850122311200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58875 + ... + 71954.

It is an arithmetic number, because the mean of its divisors is an integer number (50369550).

Almost surely, 2^855621660 is an apocalyptic number.

It is an amenable number.

855621660 is an abundant number, since it is smaller than the sum of its proper divisors (1562116740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

855621660 is a wasteful number, since it uses less digits than its factorization.

855621660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130950 (or 130948 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 855621660 is about 29251.0112645700. The cubic root of 855621660 is about 949.3519717235.

The spelling of 855621660 in words is "eight hundred fifty-five million, six hundred twenty-one thousand, six hundred sixty".