161699145 has 8 divisors (see below), whose sum is σ = 258718656. Its totient is φ = 86239536.

The previous prime is 161699119. The next prime is 161699147. The reversal of 161699145 is 541996161.

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

It is not a de Polignac number, because 161699145 - 2¹⁶ = 161633609 is a prime.

It is a super-2 number, since 2×161699145² = 52293226987462050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161699097 and 161699106.

It is not an unprimeable number, because it can be changed into a prime (161699147) 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 7 ways as a sum of consecutive naturals, for example, 5389957 + ... + 5389986.

It is an arithmetic number, because the mean of its divisors is an integer number (32339832).

Almost surely, 2^161699145 is an apocalyptic number.

161699145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161699145 is a deficient number, since it is larger than the sum of its proper divisors (97019511).

161699145 is a wasteful number, since it uses less digits than its factorization.

161699145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10779951.

The product of its digits is 58320, while the sum is 42.

The square root of 161699145 is about 12716.0978684501. The cubic root of 161699145 is about 544.7985058804.

The spelling of 161699145 in words is "one hundred sixty-one million, six hundred ninety-nine thousand, one hundred forty-five".