161281387519 has 8 divisors (see below), whose sum is σ = 185092807680. Its totient is φ = 137662772856.

The previous prime is 161281387511. The next prime is 161281387523. The reversal of 161281387519 is 915783182161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161281387519 - 2³ = 161281387511 is a prime.

It is a super-2 number, since 2×161281387519² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161281387511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48199579 + ... + 48202924.

It is an arithmetic number, because the mean of its divisors is an integer number (23136600960).

Almost surely, 2^161281387519 is an apocalyptic number.

161281387519 is a deficient number, since it is larger than the sum of its proper divisors (23811420161).

161281387519 is an equidigital number, since it uses as much as digits as its factorization.

161281387519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96402749.

The product of its digits is 725760, while the sum is 52.

The spelling of 161281387519 in words is "one hundred sixty-one billion, two hundred eighty-one million, three hundred eighty-seven thousand, five hundred nineteen".