1561094663138 has 8 divisors (see below), whose sum is σ = 2443452516288. Its totient is φ = 746610491044.

The previous prime is 1561094663099. The next prime is 1561094663153. The reversal of 1561094663138 is 8313664901651.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1561094663138.

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, 16968420206 + ... + 16968420297.

It is an arithmetic number, because the mean of its divisors is an integer number (305431564536).

Almost surely, 2^{1561094663138} is an apocalyptic number.

1561094663138 is a deficient number, since it is larger than the sum of its proper divisors (882357853150).

1561094663138 is a wasteful number, since it uses less digits than its factorization.

1561094663138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33936840528.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 1561094663138 in words is "one trillion, five hundred sixty-one billion, ninety-four million, six hundred sixty-three thousand, one hundred thirty-eight".