25773011961 has 4 divisors (see below), whose sum is σ = 34364015952. Its totient is φ = 17182007972.

The previous prime is 25773011941. The next prime is 25773011969. The reversal of 25773011961 is 16911037752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25773011961 - 2¹³ = 25773003769 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25773011969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4295501991 + ... + 4295501996.

It is an arithmetic number, because the mean of its divisors is an integer number (8591003988).

Almost surely, 2^25773011961 is an apocalyptic number.

It is an amenable number.

25773011961 is a deficient number, since it is larger than the sum of its proper divisors (8591003991).

25773011961 is an equidigital number, since it uses as much as digits as its factorization.

25773011961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591003990.

The product of its (nonzero) digits is 79380, while the sum is 42.

The spelling of 25773011961 in words is "twenty-five billion, seven hundred seventy-three million, eleven thousand, nine hundred sixty-one".