1561717007960 has 64 divisors (see below), whose sum is σ = 3534175782720. Its totient is φ = 621084119040.

The previous prime is 1561717007953. The next prime is 1561717008011. The reversal of 1561717007960 is 697007171651.

It is a junction number, because it is equal to n+sod(n) for n = 1561717007899 and 1561717007908.

It is a congruent number.

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, 5816597 + ... + 6079163.

It is an arithmetic number, because the mean of its divisors is an integer number (55221496605).

Almost surely, 2^{1561717007960} is an apocalyptic number.

1561717007960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561717007960 is an abundant number, since it is smaller than the sum of its proper divisors (1972458774760).

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

1561717007960 is a wasteful number, since it uses less digits than its factorization.

1561717007960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263436 (or 263432 counting only the distinct ones).

The product of its (nonzero) digits is 555660, while the sum is 50.

The spelling of 1561717007960 in words is "one trillion, five hundred sixty-one billion, seven hundred seventeen million, seven thousand, nine hundred sixty".