1561471771392 has 216 divisors, whose sum is σ = 4850179294688. Its totient is φ = 480278937600.

The previous prime is 1561471771381. The next prime is 1561471771399. The reversal of 1561471771392 is 2931771741651.

1561471771392 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 471 + 77 + 13 + 92 = 666.

It is not an unprimeable number, because it can be changed into a prime (1561471771399) 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 23 ways as a sum of consecutive naturals, for example, 100660917 + ... + 100676427.

Almost surely, 2^{1561471771392} is an apocalyptic number.

1561471771392 is a gapful number since it is divisible by the number (12) 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 1561471771392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2425089647344).

1561471771392 is an abundant number, since it is smaller than the sum of its proper divisors (3288707523296).

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

1561471771392 is a wasteful number, since it uses less digits than its factorization.

1561471771392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18907 (or 18890 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The spelling of 1561471771392 in words is "one trillion, five hundred sixty-one billion, four hundred seventy-one million, seven hundred seventy-one thousand, three hundred ninety-two".