26347997381 has 4 divisors (see below), whose sum is σ = 26549127264. Its totient is φ = 26146867500.

The previous prime is 26347997359. The next prime is 26347997437. The reversal of 26347997381 is 18379974362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26347997381 - 2⁶ = 26347997317 is a prime.

It is a super-2 number, since 2×26347997381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 26347997381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26347997311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100564745 + ... + 100565006.

It is an arithmetic number, because the mean of its divisors is an integer number (6637281816).

Almost surely, 2^26347997381 is an apocalyptic number.

It is an amenable number.

26347997381 is a deficient number, since it is larger than the sum of its proper divisors (201129883).

26347997381 is a wasteful number, since it uses less digits than its factorization.

26347997381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201129882.

The product of its digits is 13716864, while the sum is 59.

The spelling of 26347997381 in words is "twenty-six billion, three hundred forty-seven million, nine hundred ninety-seven thousand, three hundred eighty-one".