26820437157 has 6 divisors (see below), whose sum is σ = 38740631462. Its totient is φ = 17880291432.

The previous prime is 26820437131. The next prime is 26820437173. The reversal of 26820437157 is 75173402862.

26820437157 is a `hidden beast` number, since 2 + 68 + 2 + 0 + 437 + 157 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26534455236 + 285981921 = 162894^2 + 16911^2 .

It is not a de Polignac number, because 26820437157 - 2⁷ = 26820437029 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 (26820432157) 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, 1490024278 + ... + 1490024295.

Almost surely, 2^26820437157 is an apocalyptic number.

It is an amenable number.

26820437157 is a deficient number, since it is larger than the sum of its proper divisors (11920194305).

26820437157 is a wasteful number, since it uses less digits than its factorization.

26820437157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980048579 (or 2980048576 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 26820437157 in words is "twenty-six billion, eight hundred twenty million, four hundred thirty-seven thousand, one hundred fifty-seven".