15891020455 has 4 divisors (see below), whose sum is σ = 19069224552. Its totient is φ = 12712816360.

The previous prime is 15891020447. The next prime is 15891020471. The reversal of 15891020455 is 55402019851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55402019851 = 20599 ⋅2689549.

It is not a de Polignac number, because 15891020455 - 2³ = 15891020447 is a prime.

It is a super-2 number, since 2×15891020455² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1589102041 + ... + 1589102050.

It is an arithmetic number, because the mean of its divisors is an integer number (4767306138).

Almost surely, 2^15891020455 is an apocalyptic number.

15891020455 is a deficient number, since it is larger than the sum of its proper divisors (3178204097).

15891020455 is an equidigital number, since it uses as much as digits as its factorization.

15891020455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178204096.

The product of its (nonzero) digits is 72000, while the sum is 40.

The spelling of 15891020455 in words is "fifteen billion, eight hundred ninety-one million, twenty thousand, four hundred fifty-five".