161645007 has 16 divisors (see below), whose sum is σ = 219697920. Its totient is φ = 105698112.

The previous prime is 161644991. The next prime is 161645009. The reversal of 161645007 is 700546161.

It is not a de Polignac number, because 161645007 - 2⁴ = 161644991 is a prime.

It is a super-2 number, since 2×161645007² = 52258216576060098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161645009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30619 + ... + 35507.

It is an arithmetic number, because the mean of its divisors is an integer number (13731120).

Almost surely, 2^161645007 is an apocalyptic number.

161645007 is a deficient number, since it is larger than the sum of its proper divisors (58052913).

161645007 is a wasteful number, since it uses less digits than its factorization.

161645007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 161645007 is about 12713.9689711750. The cubic root of 161645007 is about 544.7376983155.

The spelling of 161645007 in words is "one hundred sixty-one million, six hundred forty-five thousand, seven".