161646562461 has 8 divisors (see below), whose sum is σ = 220114468224. Its totient is φ = 105471515840.

The previous prime is 161646562439. The next prime is 161646562477. The reversal of 161646562461 is 164265646161.

161646562461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161646562461 - 2⁹ = 161646561949 is a prime.

It is a super-2 number, since 2×161646562461² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161646562461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161646562411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 573214620 + ... + 573214901.

It is an arithmetic number, because the mean of its divisors is an integer number (27514308528).

Almost surely, 2^161646562461 is an apocalyptic number.

It is an amenable number.

161646562461 is a deficient number, since it is larger than the sum of its proper divisors (58467905763).

161646562461 is a wasteful number, since it uses less digits than its factorization.

161646562461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146429571.

The product of its digits is 1244160, while the sum is 48.

The spelling of 161646562461 in words is "one hundred sixty-one billion, six hundred forty-six million, five hundred sixty-two thousand, four hundred sixty-one".