161700723 has 12 divisors (see below), whose sum is σ = 241622160. Its totient is φ = 104083056.

The previous prime is 161700709. The next prime is 161700739. The reversal of 161700723 is 327007161.

It is not a de Polignac number, because 161700723 - 2¹² = 161696627 is a prime.

It is a super-2 number, since 2×161700723² = 52294247637445458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161700703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309511 + ... + 310032.

It is an arithmetic number, because the mean of its divisors is an integer number (20135180).

Almost surely, 2^161700723 is an apocalyptic number.

161700723 is a deficient number, since it is larger than the sum of its proper divisors (79921437).

161700723 is a wasteful number, since it uses less digits than its factorization.

161700723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619578 (or 619575 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 161700723 is about 12716.1599156349. The cubic root of 161700723 is about 544.8002780795.

Adding to 161700723 its reverse (327007161), we get a palindrome (488707884).

The spelling of 161700723 in words is "one hundred sixty-one million, seven hundred thousand, seven hundred twenty-three".