23178267638 has 4 divisors (see below), whose sum is σ = 34767401460. Its totient is φ = 11589133818.

The previous prime is 23178267617. The next prime is 23178267667. The reversal of 23178267638 is 83676287132.

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

It is a self number, because there is not a number n which added to its sum of digits gives 23178267638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5794566908 + ... + 5794566911.

It is an arithmetic number, because the mean of its divisors is an integer number (8691850365).

Almost surely, 2^23178267638 is an apocalyptic number.

23178267638 is a deficient number, since it is larger than the sum of its proper divisors (11589133822).

23178267638 is a wasteful number, since it uses less digits than its factorization.

23178267638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11589133821.

The product of its digits is 4064256, while the sum is 53.

The spelling of 23178267638 in words is "twenty-three billion, one hundred seventy-eight million, two hundred sixty-seven thousand, six hundred thirty-eight".