161616903 has 16 divisors (see below), whose sum is σ = 246518016. Its totient is φ = 92260800.

The previous prime is 161616901. The next prime is 161616911. The reversal of 161616903 is 309616161.

It is not a de Polignac number, because 161616903 - 2¹ = 161616901 is a prime.

It is a super-2 number, since 2×161616903² = 52240046670622818, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161616901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21828 + ... + 28278.

It is an arithmetic number, because the mean of its divisors is an integer number (15407376).

Almost surely, 2^161616903 is an apocalyptic number.

161616903 is a deficient number, since it is larger than the sum of its proper divisors (84901113).

161616903 is a wasteful number, since it uses less digits than its factorization.

161616903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7654.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 161616903 is about 12712.8636821135. The cubic root of 161616903 is about 544.7061266720.

The spelling of 161616903 in words is "one hundred sixty-one million, six hundred sixteen thousand, nine hundred three".