1561433642 has 8 divisors (see below), whose sum is σ = 2465421600. Its totient is φ = 739626444.

The previous prime is 1561433617. The next prime is 1561433651. The reversal of 1561433642 is 2463341651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20545142 + ... + 20545217.

It is an arithmetic number, because the mean of its divisors is an integer number (308177700).

Almost surely, 2^1561433642 is an apocalyptic number.

1561433642 is a deficient number, since it is larger than the sum of its proper divisors (903987958).

1561433642 is a wasteful number, since it uses less digits than its factorization.

1561433642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41090380.

The product of its digits is 51840, while the sum is 35.

The square root of 1561433642 is about 39514.9799696267. The cubic root of 1561433642 is about 1160.1331699075.

The spelling of 1561433642 in words is "one billion, five hundred sixty-one million, four hundred thirty-three thousand, six hundred forty-two".