1561131034650 has 288 divisors, whose sum is σ = 4747777122816. Its totient is φ = 378234360000.

The previous prime is 1561131034609. The next prime is 1561131034651. The reversal of 1561131034650 is 564301311651.

1561131034650 is a `hidden beast` number, since 1 + 5 + 61 + 131 + 0 + 3 + 465 + 0 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1561131034651) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 437167365 + ... + 437170935.

It is an arithmetic number, because the mean of its divisors is an integer number (16485337232).

Almost surely, 2^{1561131034650} is an apocalyptic number.

1561131034650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561131034650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2373888561408).

1561131034650 is an abundant number, since it is smaller than the sum of its proper divisors (3186646088166).

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

1561131034650 is a wasteful number, since it uses less digits than its factorization.

1561131034650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880 (or 6863 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 1561131034650 in words is "one trillion, five hundred sixty-one billion, one hundred thirty-one million, thirty-four thousand, six hundred fifty".