161266624657 has 8 divisors (see below), whose sum is σ = 161427825000. Its totient is φ = 161105478144.

The previous prime is 161266624627. The next prime is 161266624667. The reversal of 161266624657 is 756426662161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5974671616 + 155291953041 = 77296^2 + 394071^2 .

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 161266624657 - 2⁷ = 161266624529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161266624627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8569983 + ... + 8588779.

It is an arithmetic number, because the mean of its divisors is an integer number (20178478125).

Almost surely, 2^161266624657 is an apocalyptic number.

It is an amenable number.

161266624657 is a deficient number, since it is larger than the sum of its proper divisors (161200343).

161266624657 is a wasteful number, since it uses less digits than its factorization.

161266624657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26915.

The product of its digits is 4354560, while the sum is 52.

The spelling of 161266624657 in words is "one hundred sixty-one billion, two hundred sixty-six million, six hundred twenty-four thousand, six hundred fifty-seven".