161268705 has 64 divisors (see below), whose sum is σ = 316081920. Its totient is φ = 77511168.

The previous prime is 161268683. The next prime is 161268719. The reversal of 161268705 is 507862161.

161268705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161268705 - 2⁶ = 161268641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161268705.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74397 + ... + 76533.

It is an arithmetic number, because the mean of its divisors is an integer number (4938780).

Almost surely, 2^161268705 is an apocalyptic number.

161268705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161268705 is a deficient number, since it is larger than the sum of its proper divisors (154813215).

161268705 is a wasteful number, since it uses less digits than its factorization.

161268705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207 (or 2201 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 161268705 is about 12699.1615864985. The cubic root of 161268705 is about 544.3146619326.

The spelling of 161268705 in words is "one hundred sixty-one million, two hundred sixty-eight thousand, seven hundred five".