1561329245696 has 80 divisors (see below), whose sum is σ = 3405185969328. Its totient is φ = 709283020800.

The previous prime is 1561329245689. The next prime is 1561329245699. The reversal of 1561329245696 is 6965429231651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561329245699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9725696 + ... + 9884928.

Almost surely, 2^{1561329245696} is an apocalyptic number.

1561329245696 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 1561329245696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1702592984664).

1561329245696 is an abundant number, since it is smaller than the sum of its proper divisors (1843856723632).

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

1561329245696 is a wasteful number, since it uses less digits than its factorization.

1561329245696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161003 (or 160987 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 59.

The spelling of 1561329245696 in words is "one trillion, five hundred sixty-one billion, three hundred twenty-nine million, two hundred forty-five thousand, six hundred ninety-six".