1661540430 has 32 divisors (see below), whose sum is σ = 4350215808. Its totient is φ = 402797600.

The previous prime is 1661540423. The next prime is 1661540467. The reversal of 1661540430 is 340451661.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 2517156 + ... + 2517815.

It is an arithmetic number, because the mean of its divisors is an integer number (135944244).

Almost surely, 2^1661540430 is an apocalyptic number.

1661540430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661540430 is an abundant number, since it is smaller than the sum of its proper divisors (2688675378).

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

1661540430 is a wasteful number, since it uses less digits than its factorization.

1661540430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5034992.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1661540430 is about 40761.9973750060. The cubic root of 1661540430 is about 1184.4142879827.

The spelling of 1661540430 in words is "one billion, six hundred sixty-one million, five hundred forty thousand, four hundred thirty".