1671521660 has 24 divisors (see below), whose sum is σ = 3510963456. Its totient is φ = 668462400.

The previous prime is 1671521659. The next prime is 1671521669. The reversal of 1671521660 is 661251761.

It is a self number, because there is not a number n which added to its sum of digits gives 1671521660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1671521669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178085 + ... + 187235.

It is an arithmetic number, because the mean of its divisors is an integer number (146290144).

Almost surely, 2^1671521660 is an apocalyptic number.

1671521660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671521660 is an abundant number, since it is smaller than the sum of its proper divisors (1839441796).

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

1671521660 is a wasteful number, since it uses less digits than its factorization.

1671521660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18293 (or 18291 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1671521660 is about 40884.2470885792. The cubic root of 1671521660 is about 1186.7812316624.

The spelling of 1671521660 in words is "one billion, six hundred seventy-one million, five hundred twenty-one thousand, six hundred sixty".