165139898 has 24 divisors (see below), whose sum is σ = 314349984. Its totient is φ = 64339800.

The previous prime is 165139889. The next prime is 165139901. The reversal of 165139898 is 898931561.

It is a happy number.

It is a super-2 number, since 2×165139898² = 54542371822900808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75518 + ... + 77673.

It is an arithmetic number, because the mean of its divisors is an integer number (13097916).

Almost surely, 2^165139898 is an apocalyptic number.

165139898 is a deficient number, since it is larger than the sum of its proper divisors (149210086).

165139898 is a wasteful number, since it uses less digits than its factorization.

165139898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153218 (or 153211 counting only the distinct ones).

The product of its digits is 466560, while the sum is 50.

The square root of 165139898 is about 12850.6769471495. The cubic root of 165139898 is about 548.6356242754.

The spelling of 165139898 in words is "one hundred sixty-five million, one hundred thirty-nine thousand, eight hundred ninety-eight".