1326666553172 has 12 divisors (see below), whose sum is σ = 2321728053876. Its totient is φ = 663315680640.

The previous prime is 1326666553097. The next prime is 1326666553237. The reversal of 1326666553172 is 2713556666231.

It can be written as a sum of positive squares in 2 ways, for example, as 997094114116 + 329572439056 = 998546^2 + 574084^2 .

It is a super-3 number, since 3×1326666553172³ (a number of 37 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4228613 + ... + 4531500.

It is an arithmetic number, because the mean of its divisors is an integer number (193477337823).

Almost surely, 2^{1326666553172} is an apocalyptic number.

It is an amenable number.

1326666553172 is a deficient number, since it is larger than the sum of its proper divisors (995061500704).

1326666553172 is a wasteful number, since it uses less digits than its factorization.

1326666553172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8797978 (or 8797976 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 53.

The spelling of 1326666553172 in words is "one trillion, three hundred twenty-six billion, six hundred sixty-six million, five hundred fifty-three thousand, one hundred seventy-two".