1561763671315 has 4 divisors (see below), whose sum is σ = 1874116405584. Its totient is φ = 1249410937048.

The previous prime is 1561763671313. The next prime is 1561763671319. The reversal of 1561763671315 is 5131763671651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1561763671315 - 2¹ = 1561763671313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561763671313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156176367127 + ... + 156176367136.

It is an arithmetic number, because the mean of its divisors is an integer number (468529101396).

Almost surely, 2^{1561763671315} is an apocalyptic number.

1561763671315 is a deficient number, since it is larger than the sum of its proper divisors (312352734269).

1561763671315 is an equidigital number, since it uses as much as digits as its factorization.

1561763671315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312352734268.

The product of its digits is 2381400, while the sum is 52.

The spelling of 1561763671315 in words is "one trillion, five hundred sixty-one billion, seven hundred sixty-three million, six hundred seventy-one thousand, three hundred fifteen".