26718937431989 has 8 divisors (see below), whose sum is σ = 29149505743680. Its totient is φ = 24288631453600.

The previous prime is 26718937431983. The next prime is 26718937431997. The reversal of 26718937431989 is 98913473981762.

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 26718937431989 - 2²⁰ = 26718936383413 is a prime.

It is a super-2 number, since 2×26718937431989² (a number of 28 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 (26718937431983) 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, 65370329 + ... + 65777790.

It is an arithmetic number, because the mean of its divisors is an integer number (3643688217960).

Almost surely, 2^{26718937431989} is an apocalyptic number.

It is an amenable number.

26718937431989 is a deficient number, since it is larger than the sum of its proper divisors (2430568311691).

26718937431989 is a wasteful number, since it uses less digits than its factorization.

26718937431989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131166651.

The product of its digits is 987614208, while the sum is 77.

The spelling of 26718937431989 in words is "twenty-six trillion, seven hundred eighteen billion, nine hundred thirty-seven million, four hundred thirty-one thousand, nine hundred eighty-nine".