26215016509 has 48 divisors (see below), whose sum is σ = 31419239040. Its totient is φ = 21782217600.

The previous prime is 26215016507. The next prime is 26215016533. The reversal of 26215016509 is 90561051262.

It is not a de Polignac number, because 26215016509 - 2¹ = 26215016507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26215016507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7430904 + ... + 7434430.

It is an arithmetic number, because the mean of its divisors is an integer number (654567480).

Almost surely, 2^26215016509 is an apocalyptic number.

It is an amenable number.

26215016509 is a deficient number, since it is larger than the sum of its proper divisors (5204222531).

26215016509 is a wasteful number, since it uses less digits than its factorization.

26215016509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682 (or 3671 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 26215016509 in words is "twenty-six billion, two hundred fifteen million, sixteen thousand, five hundred nine".