25405661126066 has 8 divisors (see below), whose sum is σ = 41039914126764. Its totient is φ = 11725689750480.

The previous prime is 25405661126033. The next prime is 25405661126093. The reversal of 25405661126066 is 66062116650452.

It can be written as a sum of positive squares in 2 ways, for example, as 24312739332025 + 1092921794041 = 4930795^2 + 1045429^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×25405661126066² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488570406245 + ... + 488570406296.

Almost surely, 2^{25405661126066} is an apocalyptic number.

25405661126066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25405661126066 is a deficient number, since it is larger than the sum of its proper divisors (15634253000698).

25405661126066 is a wasteful number, since it uses less digits than its factorization.

25405661126066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977140812556.

The product of its (nonzero) digits is 3110400, while the sum is 50.

The spelling of 25405661126066 in words is "twenty-five trillion, four hundred five billion, six hundred sixty-one million, one hundred twenty-six thousand, sixty-six".