661037527 has 2 divisors, whose sum is σ = 661037528. Its totient is φ = 661037526.

The previous prime is 661037497. The next prime is 661037539. The reversal of 661037527 is 725730166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661037527 - 2¹⁵ = 661004759 is a prime.

It is a super-2 number, since 2×661037527² = 873941224204551458, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661037567) 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 as a sum of consecutive naturals, namely, 330518763 + 330518764.

It is an arithmetic number, because the mean of its divisors is an integer number (330518764).

Almost surely, 2^661037527 is an apocalyptic number.

661037527 is a deficient number, since it is larger than the sum of its proper divisors (1).

661037527 is an equidigital number, since it uses as much as digits as its factorization.

661037527 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 661037527 is about 25710.6500695723. The cubic root of 661037527 is about 871.1147585338.

The spelling of 661037527 in words is "six hundred sixty-one million, thirty-seven thousand, five hundred twenty-seven".