165290920453 has 4 divisors (see below), whose sum is σ = 166497423660. Its totient is φ = 164084417248.

The previous prime is 165290920439. The next prime is 165290920463. The reversal of 165290920453 is 354029092561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120907807524 + 44383112929 = 347718^2 + 210673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165290920453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165290920463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603251398 + ... + 603251671.

It is an arithmetic number, because the mean of its divisors is an integer number (41624355915).

Almost surely, 2^165290920453 is an apocalyptic number.

It is an amenable number.

165290920453 is a deficient number, since it is larger than the sum of its proper divisors (1206503207).

165290920453 is a wasteful number, since it uses less digits than its factorization.

165290920453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206503206.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 165290920453 in words is "one hundred sixty-five billion, two hundred ninety million, nine hundred twenty thousand, four hundred fifty-three".