1660651560 has 48 divisors (see below), whose sum is σ = 5397118740. Its totient is φ = 442840320.

The previous prime is 1660651537. The next prime is 1660651571. The reversal of 1660651560 is 651560661.

It can be written as a sum of positive squares in 2 ways, for example, as 1558196676 + 102454884 = 39474^2 + 10122^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2306101 + ... + 2306820.

Almost surely, 2^1660651560 is an apocalyptic number.

1660651560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660651560 is an abundant number, since it is smaller than the sum of its proper divisors (3736467180).

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

1660651560 is a wasteful number, since it uses less digits than its factorization.

1660651560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612938 (or 4612931 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1660651560 is about 40751.0927460847. The cubic root of 1660651560 is about 1184.2030426225.

The spelling of 1660651560 in words is "one billion, six hundred sixty million, six hundred fifty-one thousand, five hundred sixty".