1561222831084 has 48 divisors (see below), whose sum is σ = 3141036380160. Its totient is φ = 665116784640.

The previous prime is 1561222831061. The next prime is 1561222831123. The reversal of 1561222831084 is 4801382221651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561222831084.

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, 7431739 + ... + 7638925.

It is an arithmetic number, because the mean of its divisors is an integer number (65438257920).

Almost surely, 2^{1561222831084} is an apocalyptic number.

1561222831084 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1561222831084 is an abundant number, since it is smaller than the sum of its proper divisors (1579813549076).

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

1561222831084 is a wasteful number, since it uses less digits than its factorization.

1561222831084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208798 (or 208796 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 1561222831084 in words is "one trillion, five hundred sixty-one billion, two hundred twenty-two million, eight hundred thirty-one thousand, eighty-four".