161654406 has 16 divisors (see below), whose sum is σ = 332047344. Its totient is φ = 52428384.

The previous prime is 161654371. The next prime is 161654407. The reversal of 161654406 is 604456161.

It is a happy number.

It is a super-2 number, since 2×161654406² = 52264293958425672, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161654407) 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, 363865 + ... + 364308.

It is an arithmetic number, because the mean of its divisors is an integer number (20752959).

Almost surely, 2^161654406 is an apocalyptic number.

161654406 is an abundant number, since it is smaller than the sum of its proper divisors (170392938).

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

161654406 is a wasteful number, since it uses less digits than its factorization.

161654406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728215.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 161654406 is about 12714.3385986059. The cubic root of 161654406 is about 544.7482562051.

The spelling of 161654406 in words is "one hundred sixty-one million, six hundred fifty-four thousand, four hundred six".