26157861 has 6 divisors (see below), whose sum is σ = 37783590. Its totient is φ = 17438568.

The previous prime is 26157841. The next prime is 26157863. The reversal of 26157861 is 16875162.

26157861 is a `hidden beast` number, since 26 + 1 + 578 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22896225 + 3261636 = 4785^2 + 1806^2 .

It is not a de Polignac number, because 26157861 - 2¹¹ = 26155813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26157863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1453206 + ... + 1453223.

It is an arithmetic number, because the mean of its divisors is an integer number (6297265).

Almost surely, 2^26157861 is an apocalyptic number.

It is an amenable number.

26157861 is a deficient number, since it is larger than the sum of its proper divisors (11625729).

26157861 is a wasteful number, since it uses less digits than its factorization.

26157861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906435 (or 2906432 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 26157861 is about 5114.4756329462. The cubic root of 26157861 is about 296.8479649028.

The spelling of 26157861 in words is "twenty-six million, one hundred fifty-seven thousand, eight hundred sixty-one".