161868808 has 8 divisors (see below), whose sum is σ = 303504030. Its totient is φ = 80934400.

The previous prime is 161868803. The next prime is 161868869. The reversal of 161868808 is 808868161.

It can be written as a sum of positive squares in only one way, i.e., 160326244 + 1542564 = 12662^2 + 1242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×161868808² = 52403022006681728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161868803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10116793 + ... + 10116808.

Almost surely, 2^161868808 is an apocalyptic number.

It is an amenable number.

161868808 is a deficient number, since it is larger than the sum of its proper divisors (141635222).

161868808 is a wasteful number, since it uses less digits than its factorization.

161868808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20233607 (or 20233603 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 46.

The square root of 161868808 is about 12722.7673090409. The cubic root of 161868808 is about 544.9889827473.

The spelling of 161868808 in words is "one hundred sixty-one million, eight hundred sixty-eight thousand, eight hundred eight".