26640441961 has 15 divisors (see below), whose sum is σ = 31087999293. Its totient is φ = 22827809340.

The previous prime is 26640441943. The next prime is 26640442019. The reversal of 26640441961 is 16914404662.

The square root of 26640441961 is 163219.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 26640441961 - 2¹³ = 26640433769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26640441461) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7996066 + ... + 7999396.

Almost surely, 2^26640441961 is an apocalyptic number.

26640441961 is the 163219-th square number.

26640441961 is the 81610-th centered octagonal number.

It is an amenable number.

26640441961 is a deficient number, since it is larger than the sum of its proper divisors (4447557332).

26640441961 is an frugal number, since it uses more digits than its factorization.

26640441961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690 (or 3338 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 26640441961 in words is "twenty-six billion, six hundred forty million, four hundred forty-one thousand, nine hundred sixty-one".