168165165015653 has 4 divisors (see below), whose sum is σ = 181100946939948. Its totient is φ = 155229383091360.

The previous prime is 168165165015641. The next prime is 168165165015667. The reversal of 168165165015653 is 356510561561861.

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 82309040539489 + 85856124476164 = 9072433^2 + 9265858^2 .

It is a cyclic number.

It is not a de Polignac number, because 168165165015653 - 2¹⁶ = 168165164950117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168165165015592 and 168165165015601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168165165015613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6467890962128 + ... + 6467890962153.

It is an arithmetic number, because the mean of its divisors is an integer number (45275236734987).

Almost surely, 2^{168165165015653} is an apocalyptic number.

168165165015653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

168165165015653 is a deficient number, since it is larger than the sum of its proper divisors (12935781924295).

168165165015653 is a wasteful number, since it uses less digits than its factorization.

168165165015653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12935781924294.

The product of its (nonzero) digits is 19440000, while the sum is 59.

The spelling of 168165165015653 in words is "one hundred sixty-eight trillion, one hundred sixty-five billion, one hundred sixty-five million, fifteen thousand, six hundred fifty-three".