1661447430 has 32 divisors (see below), whose sum is σ = 4430527200. Its totient is φ = 443052576.

The previous prime is 1661447363. The next prime is 1661447443. The reversal of 1661447430 is 347441661.

1661447430 is a `hidden beast` number, since 1 + 6 + 614 + 4 + 7 + 4 + 30 = 666.

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, 3076485 + ... + 3077024.

It is an arithmetic number, because the mean of its divisors is an integer number (138453975).

Almost surely, 2^1661447430 is an apocalyptic number.

1661447430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1661447430 is an abundant number, since it is smaller than the sum of its proper divisors (2769079770).

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

1661447430 is a wasteful number, since it uses less digits than its factorization.

1661447430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6153525 (or 6153519 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 1661447430 is about 40760.8565906066. The cubic root of 1661447430 is about 1184.3921894967.

The spelling of 1661447430 in words is "one billion, six hundred sixty-one million, four hundred forty-seven thousand, four hundred thirty".