66869856 has 36 divisors (see below), whose sum is σ = 190161972. Its totient is φ = 22289856.

The previous prime is 66869839. The next prime is 66869879. The reversal of 66869856 is 65896866.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115806 + ... + 116381.

It is an arithmetic number, because the mean of its divisors is an integer number (5282277).

Almost surely, 2^66869856 is an apocalyptic number.

It is an amenable number.

66869856 is an abundant number, since it is smaller than the sum of its proper divisors (123292116).

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

66869856 is a wasteful number, since it uses less digits than its factorization.

66869856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232203 (or 232192 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 66869856 is about 8177.3990975126. The cubic root of 66869856 is about 405.8916614196.

The spelling of 66869856 in words is "sixty-six million, eight hundred sixty-nine thousand, eight hundred fifty-six".