16391431754 has 4 divisors (see below), whose sum is σ = 24587147634. Its totient is φ = 8195715876.

The previous prime is 16391431747. The next prime is 16391431783. The reversal of 16391431754 is 45713419361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45713419361 = 31 ⋅1474626431.

It can be written as a sum of positive squares in only one way, i.e., 14975640625 + 1415791129 = 122375^2 + 37627^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4097857937 + ... + 4097857940.

Almost surely, 2^16391431754 is an apocalyptic number.

16391431754 is a deficient number, since it is larger than the sum of its proper divisors (8195715880).

16391431754 is an equidigital number, since it uses as much as digits as its factorization.

16391431754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8195715879.

The product of its digits is 272160, while the sum is 44.

The spelling of 16391431754 in words is "sixteen billion, three hundred ninety-one million, four hundred thirty-one thousand, seven hundred fifty-four".