161994480 has 40 divisors (see below), whose sum is σ = 502183632. Its totient is φ = 43198464.

The previous prime is 161994449. The next prime is 161994487. The reversal of 161994480 is 84499161.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161994487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337249 + ... + 337728.

Almost surely, 2^161994480 is an apocalyptic number.

161994480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161994480 is an abundant number, since it is smaller than the sum of its proper divisors (340189152).

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

161994480 is a wasteful number, since it uses less digits than its factorization.

161994480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674993 (or 674987 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 161994480 is about 12727.7052134311. The cubic root of 161994480 is about 545.1299861091.

The spelling of 161994480 in words is "one hundred sixty-one million, nine hundred ninety-four thousand, four hundred eighty".