15488545861 has 4 divisors (see below), whose sum is σ = 16399636812. Its totient is φ = 14577454912.

The previous prime is 15488545819. The next prime is 15488545871. The reversal of 15488545861 is 16854588451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16854588451 = 4721 ⋅3570131.

It can be written as a sum of positive squares in 2 ways, for example, as 4546130625 + 10942415236 = 67425^2 + 104606^2 .

It is a cyclic number.

It is not a de Polignac number, because 15488545861 - 2¹⁷ = 15488414789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15488545811) 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, 455545450 + ... + 455545483.

It is an arithmetic number, because the mean of its divisors is an integer number (4099909203).

Almost surely, 2^15488545861 is an apocalyptic number.

It is an amenable number.

15488545861 is a deficient number, since it is larger than the sum of its proper divisors (911090951).

15488545861 is an equidigital number, since it uses as much as digits as its factorization.

15488545861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911090950.

The product of its digits is 6144000, while the sum is 55.

The spelling of 15488545861 in words is "fifteen billion, four hundred eighty-eight million, five hundred forty-five thousand, eight hundred sixty-one".