26151994138 has 4 divisors (see below), whose sum is σ = 39227991210. Its totient is φ = 13075997068.

The previous prime is 26151994093. The next prime is 26151994189. The reversal of 26151994138 is 83149915162.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 18747907929 + 7404086209 = 136923^2 + 86047^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26151994091 and 26151994100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6537998533 + ... + 6537998536.

Almost surely, 2^26151994138 is an apocalyptic number.

26151994138 is a deficient number, since it is larger than the sum of its proper divisors (13075997072).

26151994138 is a wasteful number, since it uses less digits than its factorization.

26151994138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13075997071.

The product of its digits is 466560, while the sum is 49.

The spelling of 26151994138 in words is "twenty-six billion, one hundred fifty-one million, nine hundred ninety-four thousand, one hundred thirty-eight".