133721172385 has 8 divisors (see below), whose sum is σ = 160515121320. Its totient is φ = 106943794944.

The previous prime is 133721172373. The next prime is 133721172407. The reversal of 133721172385 is 583271127331.

It can be written as a sum of positive squares in 4 ways, for example, as 753008481 + 132968163904 = 27441^2 + 364648^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133721172385 - 2¹⁹ = 133720648097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4125112 + ... + 4157401.

It is an arithmetic number, because the mean of its divisors is an integer number (20064390165).

Almost surely, 2^133721172385 is an apocalyptic number.

It is an amenable number.

133721172385 is a deficient number, since it is larger than the sum of its proper divisors (26793948935).

133721172385 is an equidigital number, since it uses as much as digits as its factorization.

133721172385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8285747.

The product of its digits is 211680, while the sum is 43.

The spelling of 133721172385 in words is "one hundred thirty-three billion, seven hundred twenty-one million, one hundred seventy-two thousand, three hundred eighty-five".