26173091961 has 9 divisors (see below), whose sum is σ = 37806278341. Its totient is φ = 17448404412.

The previous prime is 26173091953. The next prime is 26173091969. The reversal of 26173091961 is 16919037162.

The square root of 26173091961 is 161781.

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

It is an interprime number because it is at equal distance from previous prime (26173091953) and next prime (26173091969).

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 26173091961 - 2³ = 26173091953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26173091969) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 458380 + ... + 512306.

Almost surely, 2^26173091961 is an apocalyptic number.

26173091961 is the 161781-st square number.

26173091961 is the 80891-st centered octagonal number.

It is an amenable number.

26173091961 is a deficient number, since it is larger than the sum of its proper divisors (11633186380).

26173091961 is an frugal number, since it uses more digits than its factorization.

26173091961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107860 (or 53930 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The spelling of 26173091961 in words is "twenty-six billion, one hundred seventy-three million, ninety-one thousand, nine hundred sixty-one".