661162507 has 2 divisors, whose sum is σ = 661162508. Its totient is φ = 661162506.

The previous prime is 661162493. The next prime is 661162529. The reversal of 661162507 is 705261166.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661162507 is a prime.

It is not a weakly prime, because it can be changed into another prime (661162547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330581253 + 330581254.

It is an arithmetic number, because the mean of its divisors is an integer number (330581254).

Almost surely, 2^661162507 is an apocalyptic number.

661162507 is a deficient number, since it is larger than the sum of its proper divisors (1).

661162507 is an equidigital number, since it uses as much as digits as its factorization.

661162507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 661162507 is about 25713.0804650085. The cubic root of 661162507 is about 871.1696545911.

The spelling of 661162507 in words is "six hundred sixty-one million, one hundred sixty-two thousand, five hundred seven".