1561761927936 has 720 divisors, whose sum is σ = 5523833145600. Its totient is φ = 429413031936.

The previous prime is 1561761927893. The next prime is 1561761927997. The reversal of 1561761927936 is 6397291671651.

It is a happy number.

1561761927936 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 7 + 619 + 2 + 7 + 9 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2369896375 + ... + 2369897033.

It is an arithmetic number, because the mean of its divisors is an integer number (7671990480).

Almost surely, 2^{1561761927936} is an apocalyptic number.

1561761927936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561761927936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2761916572800).

1561761927936 is an abundant number, since it is smaller than the sum of its proper divisors (3962071217664).

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

1561761927936 is an equidigital number, since it uses as much as digits as its factorization.

1561761927936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1263 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 63.

The spelling of 1561761927936 in words is "one trillion, five hundred sixty-one billion, seven hundred sixty-one million, nine hundred twenty-seven thousand, nine hundred thirty-six".