161658821627 has 8 divisors (see below), whose sum is σ = 170200603200. Its totient is φ = 153120382344.

The previous prime is 161658821609. The next prime is 161658821671. The reversal of 161658821627 is 726128856161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161658821627 - 2¹² = 161658817531 is a prime.

It is a super-2 number, since 2×161658821627² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161658821677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 735977 + ... + 930042.

It is an arithmetic number, because the mean of its divisors is an integer number (21275075400).

Almost surely, 2^161658821627 is an apocalyptic number.

161658821627 is a deficient number, since it is larger than the sum of its proper divisors (8541781573).

161658821627 is a wasteful number, since it uses less digits than its factorization.

161658821627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671145.

The product of its digits is 1935360, while the sum is 53.

The spelling of 161658821627 in words is "one hundred sixty-one billion, six hundred fifty-eight million, eight hundred twenty-one thousand, six hundred twenty-seven".