1561215026136 has 128 divisors (see below), whose sum is σ = 4244849038080. Its totient is φ = 476668870656.

The previous prime is 1561215026113. The next prime is 1561215026141. The reversal of 1561215026136 is 6316205121651.

It is a junction number, because it is equal to n+sod(n) for n = 1561215026094 and 1561215026103.

It is a congruent number.

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, 1924840 + ... + 2612936.

It is an arithmetic number, because the mean of its divisors is an integer number (33162883110).

Almost surely, 2^{1561215026136} 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 1561215026136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2122424519040).

1561215026136 is an abundant number, since it is smaller than the sum of its proper divisors (2683634011944).

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

1561215026136 is a wasteful number, since it uses less digits than its factorization.

1561215026136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688273 (or 688269 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 1561215026136 in words is "one trillion, five hundred sixty-one billion, two hundred fifteen million, twenty-six thousand, one hundred thirty-six".