1561015571316 has 24 divisors (see below), whose sum is σ = 3678432735264. Its totient is φ = 515186656800.

The previous prime is 1561015571309. The next prime is 1561015571347. The reversal of 1561015571316 is 6131755101651.

It is a super-2 number, since 2×1561015571316² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643982110 + ... + 643984533.

It is an arithmetic number, because the mean of its divisors is an integer number (153268030636).

Almost surely, 2^{1561015571316} is an apocalyptic number.

It is an amenable number.

1561015571316 is an abundant number, since it is smaller than the sum of its proper divisors (2117417163948).

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

1561015571316 is a wasteful number, since it uses less digits than its factorization.

1561015571316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287966751 (or 1287966749 counting only the distinct ones).

The product of its (nonzero) digits is 94500, while the sum is 42.

The spelling of 1561015571316 in words is "one trillion, five hundred sixty-one billion, fifteen million, five hundred seventy-one thousand, three hundred sixteen".