26151643581 has 32 divisors (see below), whose sum is σ = 40294802688. Its totient is φ = 14777303040.

The previous prime is 26151643579. The next prime is 26151643591. The reversal of 26151643581 is 18534615162.

It is not a de Polignac number, because 26151643581 - 2¹ = 26151643579 is a prime.

It is a super-2 number, since 2×26151643581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26151643501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2767641 + ... + 2777073.

It is an arithmetic number, because the mean of its divisors is an integer number (1259212584).

Almost surely, 2^26151643581 is an apocalyptic number.

26151643581 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26151643581 is a deficient number, since it is larger than the sum of its proper divisors (14143159107).

26151643581 is a wasteful number, since it uses less digits than its factorization.

26151643581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10901.

The product of its digits is 172800, while the sum is 42.

The spelling of 26151643581 in words is "twenty-six billion, one hundred fifty-one million, six hundred forty-three thousand, five hundred eighty-one".