66078963 has 8 divisors (see below), whose sum is σ = 97894800. Its totient is φ = 44052624.

The previous prime is 66078953. The next prime is 66079007. The reversal of 66078963 is 36987066.

It is not a de Polignac number, because 66078963 - 2⁶ = 66078899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66078953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1223658 + ... + 1223711.

It is an arithmetic number, because the mean of its divisors is an integer number (12236850).

Almost surely, 2^66078963 is an apocalyptic number.

66078963 is a deficient number, since it is larger than the sum of its proper divisors (31815837).

66078963 is a wasteful number, since it uses less digits than its factorization.

66078963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447378 (or 2447372 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66078963 is about 8128.8967886178. The cubic root of 66078963 is about 404.2851037081.

The spelling of 66078963 in words is "sixty-six million, seventy-eight thousand, nine hundred sixty-three".