661190527 has 2 divisors, whose sum is σ = 661190528. Its totient is φ = 661190526.

The previous prime is 661190513. The next prime is 661190573. The reversal of 661190527 is 725091166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661190527 - 2¹⁹ = 660666239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661190587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330595263 + 330595264.

It is an arithmetic number, because the mean of its divisors is an integer number (330595264).

Almost surely, 2^661190527 is an apocalyptic number.

661190527 is a deficient number, since it is larger than the sum of its proper divisors (1).

661190527 is an equidigital number, since it uses as much as digits as its factorization.

661190527 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 661190527 is about 25713.6253181071. The cubic root of 661190527 is about 871.1819611111.

The spelling of 661190527 in words is "six hundred sixty-one million, one hundred ninety thousand, five hundred twenty-seven".