1661560530 has 64 divisors (see below), whose sum is σ = 4604463360. Its totient is φ = 375865344.

The previous prime is 1661560499. The next prime is 1661560553. The reversal of 1661560530 is 350651661.

It is a junction number, because it is equal to n+sod(n) for n = 1661560491 and 1661560500.

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, 20415 + ... + 61154.

It is an arithmetic number, because the mean of its divisors is an integer number (71944740).

Almost surely, 2^1661560530 is an apocalyptic number.

1661560530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661560530 is an abundant number, since it is smaller than the sum of its proper divisors (2942902830).

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

1661560530 is a wasteful number, since it uses less digits than its factorization.

1661560530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81683.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 1661560530 is about 40762.2439274385. The cubic root of 1661560530 is about 1184.4190639988.

The spelling of 1661560530 in words is "one billion, six hundred sixty-one million, five hundred sixty thousand, five hundred thirty".