16542621431 has 16 divisors (see below), whose sum is σ = 19482734400. Its totient is φ = 14038970400.

The previous prime is 16542621413. The next prime is 16542621463. The reversal of 16542621431 is 13412624561.

It is a de Polignac number, because none of the positive numbers 2^k-16542621431 is a prime.

It is a super-2 number, since 2×16542621431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16542621391 and 16542621400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16542624431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204116 + ... + 273401.

It is an arithmetic number, because the mean of its divisors is an integer number (1217670900).

Almost surely, 2^16542621431 is an apocalyptic number.

16542621431 is a deficient number, since it is larger than the sum of its proper divisors (2940112969).

16542621431 is an equidigital number, since it uses as much as digits as its factorization.

16542621431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477639 (or 477625 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The spelling of 16542621431 in words is "sixteen billion, five hundred forty-two million, six hundred twenty-one thousand, four hundred thirty-one".