19126431623 has 4 divisors (see below), whose sum is σ = 20597695608. Its totient is φ = 17655167640.

The previous prime is 19126431619. The next prime is 19126431629. The reversal of 19126431623 is 32613462191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19126431623 - 2² = 19126431619 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 (19126431629) 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, 735631973 + ... + 735631998.

It is an arithmetic number, because the mean of its divisors is an integer number (5149423902).

Almost surely, 2^19126431623 is an apocalyptic number.

19126431623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19126431623 is a deficient number, since it is larger than the sum of its proper divisors (1471263985).

19126431623 is a wasteful number, since it uses less digits than its factorization.

19126431623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471263984.

The product of its digits is 46656, while the sum is 38.

The spelling of 19126431623 in words is "nineteen billion, one hundred twenty-six million, four hundred thirty-one thousand, six hundred twenty-three".