1561191137507 has 8 divisors (see below), whose sum is σ = 1586579240640. Its totient is φ = 1535943689280.

The previous prime is 1561191137497. The next prime is 1561191137551. The reversal of 1561191137507 is 7057311911651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1561191137507 - 2¹⁴ = 1561191121123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561191137567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35141348 + ... + 35185745.

It is an arithmetic number, because the mean of its divisors is an integer number (198322405080).

Almost surely, 2^{1561191137507} is an apocalyptic number.

1561191137507 is a deficient number, since it is larger than the sum of its proper divisors (25388103133).

1561191137507 is an equidigital number, since it uses as much as digits as its factorization.

1561191137507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70327453.

The product of its (nonzero) digits is 198450, while the sum is 47.

The spelling of 1561191137507 in words is "one trillion, five hundred sixty-one billion, one hundred ninety-one million, one hundred thirty-seven thousand, five hundred seven".