165988507 has 2 divisors, whose sum is σ = 165988508. Its totient is φ = 165988506.

The previous prime is 165988469. The next prime is 165988519. The reversal of 165988507 is 705889561.

165988507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165988507 is a prime.

It is not a weakly prime, because it can be changed into another prime (165988577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82994253 + 82994254.

It is an arithmetic number, because the mean of its divisors is an integer number (82994254).

Almost surely, 2^165988507 is an apocalyptic number.

165988507 is a deficient number, since it is larger than the sum of its proper divisors (1).

165988507 is an equidigital number, since it uses as much as digits as its factorization.

165988507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 49.

The square root of 165988507 is about 12883.6527041053. The cubic root of 165988507 is about 549.5737821882.

The spelling of 165988507 in words is "one hundred sixty-five million, nine hundred eighty-eight thousand, five hundred seven".