1561225225560 has 256 divisors, whose sum is σ = 6288572021760. Its totient is φ = 299455764480.

The previous prime is 1561225225543. The next prime is 1561225225561. The reversal of 1561225225560 is 655225221651.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561225225561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6378487 + ... + 6618726.

It is an arithmetic number, because the mean of its divisors is an integer number (24564734460).

Almost surely, 2^{1561225225560} is an apocalyptic number.

1561225225560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561225225560 is an abundant number, since it is smaller than the sum of its proper divisors (4727346796200).

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

1561225225560 is a wasteful number, since it uses less digits than its factorization.

1561225225560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12997258 (or 12997254 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 1561225225560 in words is "one trillion, five hundred sixty-one billion, two hundred twenty-five million, two hundred twenty-five thousand, five hundred sixty".