161816810 has 48 divisors (see below), whose sum is σ = 307037952. Its totient is φ = 61387200.

The previous prime is 161816801. The next prime is 161816861. The reversal of 161816810 is 18618161.

It is a super-2 number, since 2×161816810² = 52369359997152200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 596975 + ... + 597245.

It is an arithmetic number, because the mean of its divisors is an integer number (6396624).

Almost surely, 2^161816810 is an apocalyptic number.

161816810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161816810 is a deficient number, since it is larger than the sum of its proper divisors (145221142).

161816810 is a wasteful number, since it uses less digits than its factorization.

161816810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 161816810 is about 12720.7236429379. The cubic root of 161816810 is about 544.9306199030.

The spelling of 161816810 in words is "one hundred sixty-one million, eight hundred sixteen thousand, eight hundred ten".