161654405 has 8 divisors (see below), whose sum is σ = 211620384. Its totient is φ = 117566800.

The previous prime is 161654371. The next prime is 161654407. The reversal of 161654405 is 504456161.

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

It is not a de Polignac number, because 161654405 - 2¹⁰ = 161653381 is a prime.

It is a super-2 number, since 2×161654405² = 52264293311808050, which contains 22 as substring.

It is a Duffinian 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, 1469531 + ... + 1469640.

It is an arithmetic number, because the mean of its divisors is an integer number (26452548).

Almost surely, 2^161654405 is an apocalyptic number.

It is an amenable number.

161654405 is a deficient number, since it is larger than the sum of its proper divisors (49965979).

161654405 is a wasteful number, since it uses less digits than its factorization.

161654405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939187.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 161654405 is about 12714.3385592802. The cubic root of 161654405 is about 544.7482550818.

The spelling of 161654405 in words is "one hundred sixty-one million, six hundred fifty-four thousand, four hundred five".