66526881 has 8 divisors (see below), whose sum is σ = 88774944. Its totient is φ = 44315040.

The previous prime is 66526853. The next prime is 66526883. The reversal of 66526881 is 18862566.

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

It is not a de Polignac number, because 66526881 - 2⁵ = 66526849 is a prime.

It is a super-2 number, since 2×66526881² = 8851651791176322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66526883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4431 + ... + 12356.

It is an arithmetic number, because the mean of its divisors is an integer number (11096868).

Almost surely, 2^66526881 is an apocalyptic number.

It is an amenable number.

66526881 is a deficient number, since it is larger than the sum of its proper divisors (22248063).

66526881 is a wasteful number, since it uses less digits than its factorization.

66526881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18111.

The product of its digits is 138240, while the sum is 42.

The square root of 66526881 is about 8156.4012284831. The cubic root of 66526881 is about 405.1965331762.

The spelling of 66526881 in words is "sixty-six million, five hundred twenty-six thousand, eight hundred eighty-one".