133696266025 has 81 divisors (see below), whose sum is σ = 199864753317. Its totient is φ = 88456838400.

The previous prime is 133696266023. The next prime is 133696266049. The reversal of 133696266025 is 520662696331.

The square root of 133696266025 is 365645.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 18512051481 + 115184214544 = 136059^2 + 339388^2 .

It is not a de Polignac number, because 133696266025 - 2¹ = 133696266023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 133696266025.

It is not an unprimeable number, because it can be changed into a prime (133696266023) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 396724657 + ... + 396724993.

Almost surely, 2^133696266025 is an apocalyptic number.

133696266025 is the 365645-th square number.

133696266025 is the 182823-rd centered octagonal number.

It is an amenable number.

133696266025 is a deficient number, since it is larger than the sum of its proper divisors (66168487292).

133696266025 is an frugal number, since it uses more digits than its factorization.

133696266025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 49.

Multiplying 133696266025 by its sum of digits (49), we get a square (6551117035225 = 2559515²).

133696266025 divided by its sum of digits (49) gives a square (2728495225 = 52235²).

The spelling of 133696266025 in words is "one hundred thirty-three billion, six hundred ninety-six million, two hundred sixty-six thousand, twenty-five".