666278216802 has 48 divisors (see below), whose sum is σ = 1576419466752. Its totient is φ = 201699920160.

The previous prime is 666278216797. The next prime is 666278216833. The reversal of 666278216802 is 208612872666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1490178 + ... + 1884989.

It is an arithmetic number, because the mean of its divisors is an integer number (32842072224).

Almost surely, 2^666278216802 is an apocalyptic number.

666278216802 is an abundant number, since it is smaller than the sum of its proper divisors (910141249950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666278216802 is a wasteful number, since it uses less digits than its factorization.

666278216802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376183 (or 3376180 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 666278216802 in words is "six hundred sixty-six billion, two hundred seventy-eight million, two hundred sixteen thousand, eight hundred two".