26126981973 has 10 divisors (see below), whose sum is σ = 39029195414. Its totient is φ = 17417987928.

The previous prime is 26126981971. The next prime is 26126981987. The reversal of 26126981973 is 37918962162.

26126981973 is a `hidden beast` number, since 2 + 612 + 6 + 9 + 8 + 19 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23170015089 + 2956966884 = 152217^2 + 54378^2 .

It is not a de Polignac number, because 26126981973 - 2¹ = 26126981971 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26126981971) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 161277586 + ... + 161277747.

Almost surely, 2^26126981973 is an apocalyptic number.

It is an amenable number.

26126981973 is a deficient number, since it is larger than the sum of its proper divisors (12902213441).

26126981973 is an equidigital number, since it uses as much as digits as its factorization.

26126981973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322555345 (or 322555336 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 26126981973 in words is "twenty-six billion, one hundred twenty-six million, nine hundred eighty-one thousand, nine hundred seventy-three".