26691664263 has 8 divisors (see below), whose sum is σ = 38824238976. Its totient is φ = 16176766200.

The previous prime is 26691664199. The next prime is 26691664273. The reversal of 26691664263 is 36246619662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26691664263 - 2⁶ = 26691664199 is a prime.

It is a super-2 number, since 2×26691664263² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26691664273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404419123 + ... + 404419188.

It is an arithmetic number, because the mean of its divisors is an integer number (4853029872).

Almost surely, 2^26691664263 is an apocalyptic number.

26691664263 is a deficient number, since it is larger than the sum of its proper divisors (12132574713).

26691664263 is a wasteful number, since it uses less digits than its factorization.

26691664263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808838325.

The product of its digits is 3359232, while the sum is 51.

The spelling of 26691664263 in words is "twenty-six billion, six hundred ninety-one million, six hundred sixty-four thousand, two hundred sixty-three".