161557054 has 8 divisors (see below), whose sum is σ = 245403360. Its totient is φ = 79755936.

The previous prime is 161557051. The next prime is 161557127. The reversal of 161557054 is 450755161.

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

It is a super-2 number, since 2×161557054² = 52201363394317832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161557051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511099 + ... + 511414.

It is an arithmetic number, because the mean of its divisors is an integer number (30675420).

Almost surely, 2^161557054 is an apocalyptic number.

161557054 is a deficient number, since it is larger than the sum of its proper divisors (83846306).

161557054 is a wasteful number, since it uses less digits than its factorization.

161557054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022594.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 161557054 is about 12710.5095885256. The cubic root of 161557054 is about 544.6388809378.

The spelling of 161557054 in words is "one hundred sixty-one million, five hundred fifty-seven thousand, fifty-four".