15871420397029 has 4 divisors (see below), whose sum is σ = 15871659847660. Its totient is φ = 15871180946400.

The previous prime is 15871420397023. The next prime is 15871420397089. The reversal of 15871420397029 is 92079302417851.

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 3944771961025 + 11926648436004 = 1986145^2 + 3453498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15871420397029 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 (15871420397023) 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, 119625864 + ... + 119758465.

It is an arithmetic number, because the mean of its divisors is an integer number (3967914961915).

Almost surely, 2^{15871420397029} is an apocalyptic number.

It is an amenable number.

15871420397029 is a deficient number, since it is larger than the sum of its proper divisors (239450631).

15871420397029 is an equidigital number, since it uses as much as digits as its factorization.

15871420397029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239450630.

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 15871420397029 in words is "fifteen trillion, eight hundred seventy-one billion, four hundred twenty million, three hundred ninety-seven thousand, twenty-nine".