15974228987 has 4 divisors (see below), whose sum is σ = 15979959360. Its totient is φ = 15968498616.

The previous prime is 15974228957. The next prime is 15974228989. The reversal of 15974228987 is 78982247951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78982247951 = 157 ⋅503071643.

It is a cyclic number.

It is not a de Polignac number, because 15974228987 - 2²⁴ = 15957451771 is a prime.

It is a super-2 number, since 2×15974228987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15974228989) 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, 2861003 + ... + 2866580.

It is an arithmetic number, because the mean of its divisors is an integer number (3994989840).

Almost surely, 2^15974228987 is an apocalyptic number.

15974228987 is a deficient number, since it is larger than the sum of its proper divisors (5730373).

15974228987 is an equidigital number, since it uses as much as digits as its factorization.

15974228987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5730372.

The product of its digits is 20321280, while the sum is 62.

The spelling of 15974228987 in words is "fifteen billion, nine hundred seventy-four million, two hundred twenty-eight thousand, nine hundred eighty-seven".