1561251562215 has 64 divisors (see below), whose sum is σ = 2707192627200. Its totient is φ = 766305862784.

The previous prime is 1561251562193. The next prime is 1561251562229. The reversal of 1561251562215 is 5122651521651.

It is a happy number.

It is not a de Polignac number, because 1561251562215 - 2⁸ = 1561251561959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 140716 + ... + 1772654.

It is an arithmetic number, because the mean of its divisors is an integer number (42299884800).

Almost surely, 2^{1561251562215} is an apocalyptic number.

1561251562215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1561251562215 is a deficient number, since it is larger than the sum of its proper divisors (1145941064985).

1561251562215 is a wasteful number, since it uses less digits than its factorization.

1561251562215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632076.

The product of its digits is 180000, while the sum is 42.

The spelling of 1561251562215 in words is "one trillion, five hundred sixty-one billion, two hundred fifty-one million, five hundred sixty-two thousand, two hundred fifteen".