26501275137640 has 16 divisors (see below), whose sum is σ = 59627869059780. Its totient is φ = 10600510055040.

The previous prime is 26501275137593. The next prime is 26501275137671. The reversal of 26501275137640 is 4673157210562.

It can be written as a sum of positive squares in 2 ways, for example, as 25850248850596 + 651026287044 = 5084314^2 + 806862^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331265939181 + ... + 331265939260.

Almost surely, 2^{26501275137640} is an apocalyptic number.

26501275137640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26501275137640 is an abundant number, since it is smaller than the sum of its proper divisors (33126593922140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26501275137640 is a wasteful number, since it uses less digits than its factorization.

26501275137640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662531878452 (or 662531878448 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 26501275137640 in words is "twenty-six trillion, five hundred one billion, two hundred seventy-five million, one hundred thirty-seven thousand, six hundred forty".