1561251562242 has 8 divisors (see below), whose sum is σ = 3122503124496. Its totient is φ = 520417187412.

The previous prime is 1561251562229. The next prime is 1561251562289. The reversal of 1561251562242 is 2422651521651.

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

1561251562242 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1561251562194 and 1561251562203.

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, 130104296848 + ... + 130104296859.

It is an arithmetic number, because the mean of its divisors is an integer number (390312890562).

Almost surely, 2^{1561251562242} is an apocalyptic number.

1561251562242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1561251562242 is a wasteful number, since it uses less digits than its factorization.

1561251562242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260208593712.

The product of its digits is 288000, while the sum is 42.

The spelling of 1561251562242 in words is "one trillion, five hundred sixty-one billion, two hundred fifty-one million, five hundred sixty-two thousand, two hundred forty-two".