1561656116620 has 24 divisors (see below), whose sum is σ = 3279528741888. Its totient is φ = 624652752000.

The previous prime is 1561656116617. The next prime is 1561656116623. The reversal of 1561656116620 is 266116561651.

It is an interprime number because it is at equal distance from previous prime (1561656116617) and next prime (1561656116623).

It is not an unprimeable number, because it can be changed into a prime (1561656116623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 793845 + ... + 1937395.

It is an arithmetic number, because the mean of its divisors is an integer number (136647030912).

Almost surely, 2^{1561656116620} is an apocalyptic number.

1561656116620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561656116620 is an abundant number, since it is smaller than the sum of its proper divisors (1717872625268).

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

1561656116620 is a wasteful number, since it uses less digits than its factorization.

1561656116620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211841 (or 1211839 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 1561656116620 in words is "one trillion, five hundred sixty-one billion, six hundred fifty-six million, one hundred sixteen thousand, six hundred twenty".