66204087 has 4 divisors (see below), whose sum is σ = 88272120. Its totient is φ = 44136056.

The previous prime is 66204079. The next prime is 66204109. The reversal of 66204087 is 78040266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66204087 - 2³ = 66204079 is a prime.

It is a super-2 number, since 2×66204087² = 8765962271007138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66204007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11034012 + ... + 11034017.

It is an arithmetic number, because the mean of its divisors is an integer number (22068030).

Almost surely, 2^66204087 is an apocalyptic number.

66204087 is a deficient number, since it is larger than the sum of its proper divisors (22068033).

66204087 is a wasteful number, since it uses less digits than its factorization.

66204087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22068032.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66204087 is about 8136.5893960553. The cubic root of 66204087 is about 404.5401211984.

The spelling of 66204087 in words is "sixty-six million, two hundred four thousand, eighty-seven".