3966860699878 has 4 divisors (see below), whose sum is σ = 5950291049820. Its totient is φ = 1983430349938.

The previous prime is 3966860699869. The next prime is 3966860699887. The reversal of 3966860699878 is 8789960686693.

It is a happy number.

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 (3966860699869) and next prime (3966860699887).

It is a junction number, because it is equal to n+sod(n) for n = 3966860699795 and 3966860699804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991715174968 + ... + 991715174971.

It is an arithmetic number, because the mean of its divisors is an integer number (1487572762455).

Almost surely, 2^{3966860699878} is an apocalyptic number.

3966860699878 is a deficient number, since it is larger than the sum of its proper divisors (1983430349942).

3966860699878 is a wasteful number, since it uses less digits than its factorization.

3966860699878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983430349941.

The product of its (nonzero) digits is 10158317568, while the sum is 85.

The spelling of 3966860699878 in words is "three trillion, nine hundred sixty-six billion, eight hundred sixty million, six hundred ninety-nine thousand, eight hundred seventy-eight".