66398776 has 16 divisors (see below), whose sum is σ = 128514240. Its totient is φ = 32128320.

The previous prime is 66398747. The next prime is 66398819. The reversal of 66398776 is 67789366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133621 + ... + 134116.

It is an arithmetic number, because the mean of its divisors is an integer number (8032140).

Almost surely, 2^66398776 is an apocalyptic number.

It is an amenable number.

66398776 is a deficient number, since it is larger than the sum of its proper divisors (62115464).

66398776 is a wasteful number, since it uses less digits than its factorization.

66398776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267774 (or 267770 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 52.

The square root of 66398776 is about 8148.5444098931. The cubic root of 66398776 is about 404.9362822078.

The spelling of 66398776 in words is "sixty-six million, three hundred ninety-eight thousand, seven hundred seventy-six".