661526133 has 4 divisors (see below), whose sum is σ = 882034848. Its totient is φ = 441017420.

The previous prime is 661526119. The next prime is 661526149. The reversal of 661526133 is 331625166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 661526133 - 2⁵ = 661526101 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661526094 and 661526103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661526153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110254353 + ... + 110254358.

It is an arithmetic number, because the mean of its divisors is an integer number (220508712).

Almost surely, 2^661526133 is an apocalyptic number.

It is an amenable number.

661526133 is a deficient number, since it is larger than the sum of its proper divisors (220508715).

661526133 is a wasteful number, since it uses less digits than its factorization.

661526133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220508714.

The product of its digits is 19440, while the sum is 33.

The square root of 661526133 is about 25720.1503300428. The cubic root of 661526133 is about 871.3293338818.

The spelling of 661526133 in words is "six hundred sixty-one million, five hundred twenty-six thousand, one hundred thirty-three".