25666217272 has 8 divisors (see below), whose sum is σ = 48124157400. Its totient is φ = 12833108632.

The previous prime is 25666217261. The next prime is 25666217309. The reversal of 25666217272 is 27271266652.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×25666217272² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1604138572 + ... + 1604138587.

It is an arithmetic number, because the mean of its divisors is an integer number (6015519675).

Almost surely, 2^25666217272 is an apocalyptic number.

It is an amenable number.

25666217272 is a deficient number, since it is larger than the sum of its proper divisors (22457940128).

25666217272 is a wasteful number, since it uses less digits than its factorization.

25666217272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208277165 (or 3208277161 counting only the distinct ones).

The product of its digits is 846720, while the sum is 46.

The spelling of 25666217272 in words is "twenty-five billion, six hundred sixty-six million, two hundred seventeen thousand, two hundred seventy-two".