133661897604 has 135 divisors (see below), whose sum is σ = 369122270517. Its totient is φ = 42169535712.

The previous prime is 133661897543. The next prime is 133661897657. The reversal of 133661897604 is 406798166331.

It is a happy number.

The square root of 133661897604 is 365598.

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

133661897604 is a `hidden beast` number, since 13 + 3 + 6 + 6 + 18 + 9 + 7 + 604 = 666.

It can be written as a sum of positive squares in only one way, i.e., 62501000004 + 71160897600 = 250002^2 + 266760^2 .

It is a super-2 number, since 2×133661897604² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 125033982 + ... + 125035050.

Almost surely, 2^133661897604 is an apocalyptic number.

133661897604 is the 365598-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133661897604

133661897604 is an abundant number, since it is smaller than the sum of its proper divisors (235460372913).

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

133661897604 is an equidigital number, since it uses as much as digits as its factorization.

133661897604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 133661897604 in words is "one hundred thirty-three billion, six hundred sixty-one million, eight hundred ninety-seven thousand, six hundred four".