16531232642 has 4 divisors (see below), whose sum is σ = 24796848966. Its totient is φ = 8265616320.

The previous prime is 16531232623. The next prime is 16531232657. The reversal of 16531232642 is 24623213561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24623213561 = 20261 ⋅1215301.

It can be written as a sum of positive squares in only one way, i.e., 15652762321 + 878470321 = 125111^2 + 29639^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4132808159 + ... + 4132808162.

Almost surely, 2^16531232642 is an apocalyptic number.

16531232642 is a deficient number, since it is larger than the sum of its proper divisors (8265616324).

16531232642 is an equidigital number, since it uses as much as digits as its factorization.

16531232642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8265616323.

The product of its digits is 51840, while the sum is 35.

The spelling of 16531232642 in words is "sixteen billion, five hundred thirty-one million, two hundred thirty-two thousand, six hundred forty-two".