165210661612645 has 16 divisors (see below), whose sum is σ = 216376228573632. Its totient is φ = 120097401016960.

The previous prime is 165210661612639. The next prime is 165210661612657. The reversal of 165210661612645 is 546216166012561.

It is not a de Polignac number, because 165210661612645 - 2¹³ = 165210661604453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165210661612592 and 165210661612601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 697473367 + ... + 697710196.

It is an arithmetic number, because the mean of its divisors is an integer number (13523514285852).

Almost surely, 2^{165210661612645} is an apocalyptic number.

It is an amenable number.

165210661612645 is a deficient number, since it is larger than the sum of its proper divisors (51165566960987).

165210661612645 is a wasteful number, since it uses less digits than its factorization.

165210661612645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395185732.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 165210661612645 in words is "one hundred sixty-five trillion, two hundred ten billion, six hundred sixty-one million, six hundred twelve thousand, six hundred forty-five".