1561155016616 has 32 divisors (see below), whose sum is σ = 3152414805960. Its totient is φ = 720514213632.

The previous prime is 1561155016583. The next prime is 1561155016627. The reversal of 1561155016616 is 6166105511651.

It can be written as a sum of positive squares in 4 ways, for example, as 1560825448900 + 329567716 = 1249330^2 + 18154^2 .

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, 4281566 + ... + 4631858.

Almost surely, 2^{1561155016616} is an apocalyptic number.

It is an amenable number.

1561155016616 is an abundant number, since it is smaller than the sum of its proper divisors (1591259789344).

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

1561155016616 is a wasteful number, since it uses less digits than its factorization.

1561155016616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393165 (or 393161 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 1561155016616 in words is "one trillion, five hundred sixty-one billion, one hundred fifty-five million, sixteen thousand, six hundred sixteen".