26640861039 has 126 divisors (see below), whose sum is σ = 45724343400. Its totient is φ = 15505585056.

The previous prime is 26640861029. The next prime is 26640861053. The reversal of 26640861039 is 93016804662.

26640861039 is a `hidden beast` number, since 26 + 6 + 4 + 0 + 8 + 610 + 3 + 9 = 666.

It is not a de Polignac number, because 26640861039 - 2⁸ = 26640860783 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26640860985 and 26640861003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640861019) by changing a digit.

It is a polite number, since it can be written in 125 ways as a sum of consecutive naturals, for example, 44475262 + ... + 44475860.

Almost surely, 2^26640861039 is an apocalyptic number.

26640861039 is a deficient number, since it is larger than the sum of its proper divisors (19083482361).

26640861039 is an equidigital number, since it uses as much as digits as its factorization.

26640861039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 26640861039 in words is "twenty-six billion, six hundred forty million, eight hundred sixty-one thousand, thirty-nine".