161657854 has 4 divisors (see below), whose sum is σ = 242486784. Its totient is φ = 80828926.

The previous prime is 161657819. The next prime is 161657857. The reversal of 161657854 is 458756161.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161657854² = 52266523519770632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161657854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161657857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40414462 + ... + 40414465.

It is an arithmetic number, because the mean of its divisors is an integer number (60621696).

Almost surely, 2^161657854 is an apocalyptic number.

161657854 is a deficient number, since it is larger than the sum of its proper divisors (80828930).

161657854 is an equidigital number, since it uses as much as digits as its factorization.

161657854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80828929.

The product of its digits is 201600, while the sum is 43.

The square root of 161657854 is about 12714.4741928245. The cubic root of 161657854 is about 544.7521292382.

The spelling of 161657854 in words is "one hundred sixty-one million, six hundred fifty-seven thousand, eight hundred fifty-four".