66604863 has 16 divisors (see below), whose sum is σ = 97209056. Its totient is φ = 40314240.

The previous prime is 66604859. The next prime is 66604871. The reversal of 66604863 is 36840666.

It is not a de Polignac number, because 66604863 - 2² = 66604859 is a prime.

It is a super-3 number, since 3×66604863³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66604843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11620 + ... + 16377.

It is an arithmetic number, because the mean of its divisors is an integer number (6075566).

Almost surely, 2^66604863 is an apocalyptic number.

66604863 is a deficient number, since it is larger than the sum of its proper divisors (30604193).

66604863 is a wasteful number, since it uses less digits than its factorization.

66604863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28074.

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 66604863 is about 8161.1802455282. The cubic root of 66604863 is about 405.3547935031.

The spelling of 66604863 in words is "sixty-six million, six hundred four thousand, eight hundred sixty-three".