66777398 has 4 divisors (see below), whose sum is σ = 100166100. Its totient is φ = 33388698.

The previous prime is 66777383. The next prime is 66777413. The reversal of 66777398 is 89377766.

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

It is an interprime number because it is at equal distance from previous prime (66777383) and next prime (66777413).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16694348 + ... + 16694351.

It is an arithmetic number, because the mean of its divisors is an integer number (25041525).

Almost surely, 2^66777398 is an apocalyptic number.

66777398 is a deficient number, since it is larger than the sum of its proper divisors (33388702).

66777398 is a wasteful number, since it uses less digits than its factorization.

66777398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33388701.

The product of its digits is 2667168, while the sum is 53.

The square root of 66777398 is about 8171.7438775331. The cubic root of 66777398 is about 405.7045056375.

The spelling of 66777398 in words is "sixty-six million, seven hundred seventy-seven thousand, three hundred ninety-eight".