165606423353451 has 256 divisors, whose sum is σ = 274590444257280. Its totient is φ = 98277333073920.

The previous prime is 165606423353429. The next prime is 165606423353471. The reversal of 165606423353451 is 154353324606561.

165606423353451 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 0 + 64 + 233 + 5 + 345 + 1 = 666.

It is not a de Polignac number, because 165606423353451 - 2³⁵ = 165572063615083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165606423353471) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 21583004551 + ... + 21583012223.

It is an arithmetic number, because the mean of its divisors is an integer number (1072618922880).

Almost surely, 2^{165606423353451} is an apocalyptic number.

165606423353451 is a deficient number, since it is larger than the sum of its proper divisors (108984020903829).

165606423353451 is a wasteful number, since it uses less digits than its factorization.

165606423353451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8123 (or 8117 counting only the distinct ones).

The product of its (nonzero) digits is 23328000, while the sum is 54.

The spelling of 165606423353451 in words is "one hundred sixty-five trillion, six hundred six billion, four hundred twenty-three million, three hundred fifty-three thousand, four hundred fifty-one".