26261708505 has 32 divisors (see below), whose sum is σ = 42308956800. Its totient is φ = 13909765632.

The previous prime is 26261708503. The next prime is 26261708509. The reversal of 26261708505 is 50580716262.

It is not a de Polignac number, because 26261708505 - 2¹ = 26261708503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26261708503) 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, 1673586 + ... + 1689204.

It is an arithmetic number, because the mean of its divisors is an integer number (1322154900).

Almost surely, 2^26261708505 is an apocalyptic number.

It is an amenable number.

26261708505 is a deficient number, since it is larger than the sum of its proper divisors (16047248295).

26261708505 is a wasteful number, since it uses less digits than its factorization.

26261708505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16393.

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 26261708505 in words is "twenty-six billion, two hundred sixty-one million, seven hundred eight thousand, five hundred five".