26990345591 has 8 divisors (see below), whose sum is σ = 29641626000. Its totient is φ = 24372000640.

The previous prime is 26990345581. The next prime is 26990345597. The reversal of 26990345591 is 19554309962.

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

It is a cyclic number.

It is not a de Polignac number, because 26990345591 - 2⁶ = 26990345527 is a prime.

It is a super-2 number, since 2×26990345591² (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 (26990345597) 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, 8232146 + ... + 8235423.

It is an arithmetic number, because the mean of its divisors is an integer number (3705203250).

Almost surely, 2^26990345591 is an apocalyptic number.

26990345591 is a deficient number, since it is larger than the sum of its proper divisors (2651280409).

26990345591 is a wasteful number, since it uses less digits than its factorization.

26990345591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16467729.

The product of its (nonzero) digits is 2624400, while the sum is 53.

The spelling of 26990345591 in words is "twenty-six billion, nine hundred ninety million, three hundred forty-five thousand, five hundred ninety-one".