666247642433772 has 48 divisors (see below), whose sum is σ = 1777338236335872. Its totient is φ = 190283841783360.

The previous prime is 666247642433707. The next prime is 666247642433801. The reversal of 666247642433772 is 277334246742666.

It is a super-2 number, since 2×666247642433772² (a number of 30 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 666247642433697 and 666247642433706.

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, 1512851098 + ... + 1513291425.

It is an arithmetic number, because the mean of its divisors is an integer number (37027879923664).

Almost surely, 2^{666247642433772} is an apocalyptic number.

It is an amenable number.

666247642433772 is an abundant number, since it is smaller than the sum of its proper divisors (1111090593902100).

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

666247642433772 is a wasteful number, since it uses less digits than its factorization.

666247642433772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026145158 (or 3026145156 counting only the distinct ones).

The product of its digits is 2048385024, while the sum is 69.

The spelling of 666247642433772 in words is "six hundred sixty-six trillion, two hundred forty-seven billion, six hundred forty-two million, four hundred thirty-three thousand, seven hundred seventy-two".