15361997907761 has 4 divisors (see below), whose sum is σ = 15369173060724. Its totient is φ = 15354822754800.

The previous prime is 15361997907743. The next prime is 15361997907779. The reversal of 15361997907761 is 16770979916351.

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

It is an interprime number because it is at equal distance from previous prime (15361997907743) and next prime (15361997907779).

It can be written as a sum of positive squares in 2 ways, for example, as 15109888476736 + 252109431025 = 3887144^2 + 502105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15361997907761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15361927907761) 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, 3587573270 + ... + 3587577551.

It is an arithmetic number, because the mean of its divisors is an integer number (3842293265181).

Almost surely, 2^{15361997907761} is an apocalyptic number.

It is an amenable number.

15361997907761 is a deficient number, since it is larger than the sum of its proper divisors (7175152963).

15361997907761 is an equidigital number, since it uses as much as digits as its factorization.

15361997907761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175152962.

The product of its (nonzero) digits is 135025380, while the sum is 71.

The spelling of 15361997907761 in words is "fifteen trillion, three hundred sixty-one billion, nine hundred ninety-seven million, nine hundred seven thousand, seven hundred sixty-one".