1561631787087 has 16 divisors (see below), whose sum is σ = 2099998610688. Its totient is φ = 1032213934080.

The previous prime is 1561631787041. The next prime is 1561631787143. The reversal of 1561631787087 is 7807871361651.

It is not a de Polignac number, because 1561631787087 - 2⁷ = 1561631786959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561631787087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561631787187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4523698 + ... + 4856655.

It is an arithmetic number, because the mean of its divisors is an integer number (131249913168).

Almost surely, 2^{1561631787087} is an apocalyptic number.

1561631787087 is a deficient number, since it is larger than the sum of its proper divisors (538366823601).

1561631787087 is a wasteful number, since it uses less digits than its factorization.

1561631787087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9380830.

The product of its (nonzero) digits is 11854080, while the sum is 60.

The spelling of 1561631787087 in words is "one trillion, five hundred sixty-one billion, six hundred thirty-one million, seven hundred eighty-seven thousand, eighty-seven".