66763478 has 4 divisors (see below), whose sum is σ = 100145220. Its totient is φ = 33381738.

The previous prime is 66763469. The next prime is 66763493. The reversal of 66763478 is 87436766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87436766 = 2 ⋅43718383.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16690868 + ... + 16690871.

It is an arithmetic number, because the mean of its divisors is an integer number (25036305).

Almost surely, 2^66763478 is an apocalyptic number.

66763478 is a deficient number, since it is larger than the sum of its proper divisors (33381742).

66763478 is a wasteful number, since it uses less digits than its factorization.

66763478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33381741.

The product of its digits is 1016064, while the sum is 47.

The square root of 66763478 is about 8170.8921177556. The cubic root of 66763478 is about 405.6763134680.

The spelling of 66763478 in words is "sixty-six million, seven hundred sixty-three thousand, four hundred seventy-eight".