15880427478761 has 4 divisors (see below), whose sum is σ = 16140762355524. Its totient is φ = 15620092602000.

The previous prime is 15880427478719. The next prime is 15880427478767. The reversal of 15880427478761 is 16787472408851.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9308485062361 + 6571942416400 = 3050981^2 + 2563580^2 .

It is a cyclic number.

It is not a de Polignac number, because 15880427478761 - 2¹⁴ = 15880427462377 is a prime.

It is a super-2 number, since 2×15880427478761² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15880427478691 and 15880427478700.

It is not an unprimeable number, because it can be changed into a prime (15880427478767) 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, 130167438290 + ... + 130167438411.

It is an arithmetic number, because the mean of its divisors is an integer number (4035190588881).

Almost surely, 2^{15880427478761} is an apocalyptic number.

It is an amenable number.

15880427478761 is a deficient number, since it is larger than the sum of its proper divisors (260334876763).

15880427478761 is an equidigital number, since it uses as much as digits as its factorization.

15880427478761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260334876762.

The product of its (nonzero) digits is 168591360, while the sum is 68.

The spelling of 15880427478761 in words is "fifteen trillion, eight hundred eighty billion, four hundred twenty-seven million, four hundred seventy-eight thousand, seven hundred sixty-one".