165656501353645 has 4 divisors (see below), whose sum is σ = 198787801624380. Its totient is φ = 132525201082912.

The previous prime is 165656501353571. The next prime is 165656501353699. The reversal of 165656501353645 is 546353105656561.

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 61446581631369 + 104209919722276 = 7838787^2 + 10208326^2 .

It is a cyclic number.

It is not a de Polignac number, because 165656501353645 - 2¹⁷ = 165656501222573 is a prime.

It is a super-3 number, since 3×165656501353645³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16565650135360 + ... + 16565650135369.

It is an arithmetic number, because the mean of its divisors is an integer number (49696950406095).

Almost surely, 2^{165656501353645} is an apocalyptic number.

It is an amenable number.

165656501353645 is a deficient number, since it is larger than the sum of its proper divisors (33131300270735).

165656501353645 is an equidigital number, since it uses as much as digits as its factorization.

165656501353645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33131300270734.

The product of its (nonzero) digits is 145800000, while the sum is 61.

The spelling of 165656501353645 in words is "one hundred sixty-five trillion, six hundred fifty-six billion, five hundred one million, three hundred fifty-three thousand, six hundred forty-five".