1561251562240 has 72 divisors (see below), whose sum is σ = 3749300165520. Its totient is φ = 622895026176.

The previous prime is 1561251562229. The next prime is 1561251562289. The reversal of 1561251562240 is 422651521651.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1561251562193 and 1561251562202.

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, 1069854 + ... + 2065693.

It is an arithmetic number, because the mean of its divisors is an integer number (52073613410).

Almost surely, 2^{1561251562240} is an apocalyptic number.

1561251562240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561251562240 is an abundant number, since it is smaller than the sum of its proper divisors (2188048603280).

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

1561251562240 is an equidigital number, since it uses as much as digits as its factorization.

1561251562240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135957 (or 3135943 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 1561251562240 in words is "one trillion, five hundred sixty-one billion, two hundred fifty-one million, five hundred sixty-two thousand, two hundred forty".