666226622820 has 48 divisors (see below), whose sum is σ = 2035019504448. Its totient is φ = 161509484160.

The previous prime is 666226622801. The next prime is 666226622821. The reversal of 666226622820 is 28226622666.

It is a self number, because there is not a number n which added to its sum of digits gives 666226622820.

It is not an unprimeable number, because it can be changed into a prime (666226622821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504716479 + ... + 504717798.

It is an arithmetic number, because the mean of its divisors is an integer number (42396239676).

Almost surely, 2^666226622820 is an apocalyptic number.

666226622820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666226622820 is an abundant number, since it is smaller than the sum of its proper divisors (1368792881628).

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

666226622820 is a wasteful number, since it uses less digits than its factorization.

666226622820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009434300 (or 1009434298 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 666226622820 in words is "six hundred sixty-six billion, two hundred twenty-six million, six hundred twenty-two thousand, eight hundred twenty".