26490673557 has 24 divisors (see below), whose sum is σ = 38987009880. Its totient is φ = 17328314880.

The previous prime is 26490673511. The next prime is 26490673571. The reversal of 26490673557 is 75537609462.

26490673557 is a `hidden beast` number, since 26 + 4 + 9 + 0 + 67 + 3 + 557 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 181476 + 26490492081 = 426^2 + 162759^2 .

It is not a de Polignac number, because 26490673557 - 2⁶ = 26490673493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26490623557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165553 + ... + 283529.

It is an arithmetic number, because the mean of its divisors is an integer number (1624458745).

Almost surely, 2^26490673557 is an apocalyptic number.

It is an amenable number.

26490673557 is a deficient number, since it is larger than the sum of its proper divisors (12496336323).

26490673557 is a wasteful number, since it uses less digits than its factorization.

26490673557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118453 (or 118450 counting only the distinct ones).

The product of its (nonzero) digits is 9525600, while the sum is 54.

The spelling of 26490673557 in words is "twenty-six billion, four hundred ninety million, six hundred seventy-three thousand, five hundred fifty-seven".