66877895 has 12 divisors (see below), whose sum is σ = 93356424. Its totient is φ = 45858960.

The previous prime is 66877849. The next prime is 66877897. The reversal of 66877895 is 59877866.

It is a happy number.

It is not a de Polignac number, because 66877895 - 2⁸ = 66877639 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66877895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66877897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136241 + ... + 136730.

It is an arithmetic number, because the mean of its divisors is an integer number (7779702).

Almost surely, 2^66877895 is an apocalyptic number.

66877895 is a deficient number, since it is larger than the sum of its proper divisors (26478529).

66877895 is a wasteful number, since it uses less digits than its factorization.

66877895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272990 (or 272983 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 56.

The square root of 66877895 is about 8177.8906204473. The cubic root of 66877895 is about 405.9079260094.

The spelling of 66877895 in words is "sixty-six million, eight hundred seventy-seven thousand, eight hundred ninety-five".