161801748 has 36 divisors (see below), whose sum is σ = 409864000. Its totient is φ = 53819856.

The previous prime is 161801747. The next prime is 161801753. The reversal of 161801748 is 847108161.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161801747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13461 + ... + 22467.

Almost surely, 2^161801748 is an apocalyptic number.

161801748 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161801748 is an abundant number, since it is smaller than the sum of its proper divisors (248062252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161801748 is a wasteful number, since it uses less digits than its factorization.

161801748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9516 (or 9511 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 161801748 is about 12720.1316030928. The cubic root of 161801748 is about 544.9137118952.

The spelling of 161801748 in words is "one hundred sixty-one million, eight hundred one thousand, seven hundred forty-eight".