161645006 has 4 divisors (see below), whose sum is σ = 242467512. Its totient is φ = 80822502.

The previous prime is 161644991. The next prime is 161645009. The reversal of 161645006 is 600546161.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161645006² = 52258215929480072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161645006.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 40411250 + ... + 40411253.

It is an arithmetic number, because the mean of its divisors is an integer number (60616878).

Almost surely, 2^161645006 is an apocalyptic number.

161645006 is a deficient number, since it is larger than the sum of its proper divisors (80822506).

161645006 is an equidigital number, since it uses as much as digits as its factorization.

161645006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80822505.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 161645006 is about 12713.9689318482. The cubic root of 161645006 is about 544.7376971922.

The spelling of 161645006 in words is "one hundred sixty-one million, six hundred forty-five thousand, six".