1561341660560 has 40 divisors (see below), whose sum is σ = 3960130214016. Its totient is φ = 567760603520.

The previous prime is 1561341660517. The next prime is 1561341660569. The reversal of 1561341660560 is 650661431651.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (1561341660569) 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, 887125064 + ... + 887126823.

Almost surely, 2^{1561341660560} is an apocalyptic number.

1561341660560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561341660560 is an abundant number, since it is smaller than the sum of its proper divisors (2398788553456).

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

1561341660560 is a wasteful number, since it uses less digits than its factorization.

1561341660560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774251911 (or 1774251905 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 1561341660560 in words is "one trillion, five hundred sixty-one billion, three hundred forty-one million, six hundred sixty thousand, five hundred sixty".