165253402 has 4 divisors (see below), whose sum is σ = 247880106. Its totient is φ = 82626700.

The previous prime is 165253399. The next prime is 165253409. The reversal of 165253402 is 204352561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204352561 = 7 ⋅29193223.

It can be written as a sum of positive squares in only one way, i.e., 98029801 + 67223601 = 9901^2 + 8199^2 .

It is not an unprimeable number, because it can be changed into a prime (165253409) 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, 41313349 + ... + 41313352.

Almost surely, 2^165253402 is an apocalyptic number.

165253402 is a deficient number, since it is larger than the sum of its proper divisors (82626704).

165253402 is an equidigital number, since it uses as much as digits as its factorization.

165253402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82626703.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 165253402 is about 12855.0924539655. The cubic root of 165253402 is about 548.7612916179.

The spelling of 165253402 in words is "one hundred sixty-five million, two hundred fifty-three thousand, four hundred two".