661134527 has 4 divisors (see below), whose sum is σ = 662044656. Its totient is φ = 660224400.

The previous prime is 661134511. The next prime is 661134533. The reversal of 661134527 is 725431166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661134527 - 2⁴ = 661134511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661136527) 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, 453974 + ... + 455427.

It is an arithmetic number, because the mean of its divisors is an integer number (165511164).

Almost surely, 2^661134527 is an apocalyptic number.

661134527 is a deficient number, since it is larger than the sum of its proper divisors (910129).

661134527 is an equidigital number, since it uses as much as digits as its factorization.

661134527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910128.

The product of its digits is 30240, while the sum is 35.

The square root of 661134527 is about 25712.5363781950. The cubic root of 661134527 is about 871.1573652923.

The spelling of 661134527 in words is "six hundred sixty-one million, one hundred thirty-four thousand, five hundred twenty-seven".