26284647997 has 4 divisors (see below), whose sum is σ = 26285604480. Its totient is φ = 26283691516.

The previous prime is 26284647979. The next prime is 26284648043. The reversal of 26284647997 is 79974648262.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79974648262 = 2 ⋅39987324131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26284647997 is a prime.

It is a super-2 number, since 2×26284647997² (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 (26284647097) 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, 435763 + ... + 492400.

It is an arithmetic number, because the mean of its divisors is an integer number (6571401120).

Almost surely, 2^26284647997 is an apocalyptic number.

It is an amenable number.

26284647997 is a deficient number, since it is larger than the sum of its proper divisors (956483).

26284647997 is an equidigital number, since it uses as much as digits as its factorization.

26284647997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956482.

The product of its digits is 73156608, while the sum is 64.

The spelling of 26284647997 in words is "twenty-six billion, two hundred eighty-four million, six hundred forty-seven thousand, nine hundred ninety-seven".