26465989381 has 4 divisors (see below), whose sum is σ = 28501834732. Its totient is φ = 24430144032.

The previous prime is 26465989337. The next prime is 26465989387. The reversal of 26465989381 is 18398956462.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7357350625 + 19108638756 = 85775^2 + 138234^2 .

It is a cyclic number.

It is not a de Polignac number, because 26465989381 - 2¹⁵ = 26465956613 is a prime.

It is a super-2 number, since 2×26465989381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26465989387) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1017922656 + ... + 1017922681.

It is an arithmetic number, because the mean of its divisors is an integer number (7125458683).

Almost surely, 2^26465989381 is an apocalyptic number.

It is an amenable number.

26465989381 is a deficient number, since it is larger than the sum of its proper divisors (2035845351).

26465989381 is a wasteful number, since it uses less digits than its factorization.

26465989381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035845350.

The product of its digits is 22394880, while the sum is 61.

The spelling of 26465989381 in words is "twenty-six billion, four hundred sixty-five million, nine hundred eighty-nine thousand, three hundred eighty-one".