161863810 has 8 divisors (see below), whose sum is σ = 291354876. Its totient is φ = 64745520.

The previous prime is 161863787. The next prime is 161863813. The reversal of 161863810 is 18368161.

It can be written as a sum of positive squares in 2 ways, for example, as 139310809 + 22553001 = 11803^2 + 4749^2 .

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

It is a super-2 number, since 2×161863810² = 52399785975432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161863813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8093181 + ... + 8093200.

Almost surely, 2^161863810 is an apocalyptic number.

161863810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161863810 is a deficient number, since it is larger than the sum of its proper divisors (129491066).

161863810 is a wasteful number, since it uses less digits than its factorization.

161863810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16186388.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 161863810 is about 12722.5708879927. The cubic root of 161863810 is about 544.9833735073.

The spelling of 161863810 in words is "one hundred sixty-one million, eight hundred sixty-three thousand, eight hundred ten".