66228626906940 has 48 divisors (see below), whose sum is σ = 185544511381152. Its totient is φ = 17651028504576.

The previous prime is 66228626906927. The next prime is 66228626906969. The reversal of 66228626906940 is 4960962682266.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 310475949 + ... + 310689188.

It is an arithmetic number, because the mean of its divisors is an integer number (3865510653774).

Almost surely, 2^{66228626906940} is an apocalyptic number.

66228626906940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66228626906940 is an abundant number, since it is smaller than the sum of its proper divisors (119315884474212).

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

66228626906940 is a wasteful number, since it uses less digits than its factorization.

66228626906940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621166926 (or 621166924 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 66.

The spelling of 66228626906940 in words is "sixty-six trillion, two hundred twenty-eight billion, six hundred twenty-six million, nine hundred six thousand, nine hundred forty".