1661708171580 has 96 divisors (see below), whose sum is σ = 4927713772800. Its totient is φ = 417224452608.

The previous prime is 1661708171549. The next prime is 1661708171597. The reversal of 1661708171580 is 851718071661.

It is a super-2 number, since 2×1661708171580² (a number of 25 digits) 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 31 ways as a sum of consecutive naturals, for example, 4285465 + ... + 4657104.

It is an arithmetic number, because the mean of its divisors is an integer number (51330351800).

Almost surely, 2^{1661708171580} is an apocalyptic number.

1661708171580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661708171580 is an abundant number, since it is smaller than the sum of its proper divisors (3266005601220).

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

1661708171580 is a wasteful number, since it uses less digits than its factorization.

1661708171580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8942763 (or 8942761 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 51.

It can be divided in two parts, 16617081 and 71580, that added together give a palindrome (16688661).

The spelling of 1661708171580 in words is "one trillion, six hundred sixty-one billion, seven hundred eight million, one hundred seventy-one thousand, five hundred eighty".