161607756129 has 8 divisors (see below), whose sum is σ = 215481234240. Its totient is φ = 107736391056.

The previous prime is 161607756059. The next prime is 161607756143. The reversal of 161607756129 is 921657706161.

It is a happy number.

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

It is not a de Polignac number, because 161607756129 - 2¹³ = 161607747937 is a prime.

It is a super-2 number, since 2×161607756129² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161607756169) 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, 340242 + ... + 662555.

It is an arithmetic number, because the mean of its divisors is an integer number (26935154280).

Almost surely, 2^161607756129 is an apocalyptic number.

It is an amenable number.

161607756129 is a deficient number, since it is larger than the sum of its proper divisors (53873478111).

161607756129 is a wasteful number, since it uses less digits than its factorization.

161607756129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056519.

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 161607756129 in words is "one hundred sixty-one billion, six hundred seven million, seven hundred fifty-six thousand, one hundred twenty-nine".