25446040164 has 60 divisors (see below), whose sum is σ = 70433989164. Its totient is φ = 7983069696.

The previous prime is 25446040129. The next prime is 25446040183. The reversal of 25446040164 is 46104064452.

25446040164 is a `hidden beast` number, since 2 + 5 + 44 + 604 + 0 + 1 + 6 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23491692900 + 1954347264 = 153270^2 + 44208^2 .

It is a super-2 number, since 2×25446040164² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2304409 + ... + 2315424.

Almost surely, 2^25446040164 is an apocalyptic number.

It is an amenable number.

25446040164 is an abundant number, since it is smaller than the sum of its proper divisors (44987949000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25446040164 is a wasteful number, since it uses less digits than its factorization.

25446040164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4619866 (or 4619855 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 25446040164 in words is "twenty-five billion, four hundred forty-six million, forty thousand, one hundred sixty-four".