666101633420 has 12 divisors (see below), whose sum is σ = 1398813430224. Its totient is φ = 266440653360.

The previous prime is 666101633399. The next prime is 666101633429. The reversal of 666101633420 is 24336101666.

It is not an unprimeable number, because it can be changed into a prime (666101633429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16652540816 + ... + 16652540855.

It is an arithmetic number, because the mean of its divisors is an integer number (116567785852).

Almost surely, 2^666101633420 is an apocalyptic number.

It is an amenable number.

666101633420 is an abundant number, since it is smaller than the sum of its proper divisors (732711796804).

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

666101633420 is a wasteful number, since it uses less digits than its factorization.

666101633420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33305081680 (or 33305081678 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 38.

The spelling of 666101633420 in words is "six hundred sixty-six billion, one hundred one million, six hundred thirty-three thousand, four hundred twenty".