26645616538 has 4 divisors (see below), whose sum is σ = 39968424810. Its totient is φ = 13322808268.

The previous prime is 26645616497. The next prime is 26645616551. The reversal of 26645616538 is 83561654662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21675789529 + 4969827009 = 147227^2 + 70497^2 .

It is a super-3 number, since 3×26645616538³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6661404133 + ... + 6661404136.

Almost surely, 2^26645616538 is an apocalyptic number.

26645616538 is a deficient number, since it is larger than the sum of its proper divisors (13322808272).

26645616538 is a wasteful number, since it uses less digits than its factorization.

26645616538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13322808271.

The product of its digits is 6220800, while the sum is 52.

The spelling of 26645616538 in words is "twenty-six billion, six hundred forty-five million, six hundred sixteen thousand, five hundred thirty-eight".