1561326862368 has 192 divisors, whose sum is σ = 5060411580672. Its totient is φ = 410462208000.

The previous prime is 1561326862349. The next prime is 1561326862373. The reversal of 1561326862368 is 8632686231651.

It is a super-2 number, since 2×1561326862368² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2448868 + ... + 3019868.

It is an arithmetic number, because the mean of its divisors is an integer number (26356310316).

Almost surely, 2^{1561326862368} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561326862368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2530205790336).

1561326862368 is an abundant number, since it is smaller than the sum of its proper divisors (3499084718304).

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

1561326862368 is a wasteful number, since it uses less digits than its factorization.

1561326862368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571347 (or 571339 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 57.

The spelling of 1561326862368 in words is "one trillion, five hundred sixty-one billion, three hundred twenty-six million, eight hundred sixty-two thousand, three hundred sixty-eight".