161506057 has 8 divisors (see below), whose sum is σ = 163035776. Its totient is φ = 159982992.

The previous prime is 161506039. The next prime is 161506091. The reversal of 161506057 is 750605161.

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

It is a cyclic number.

It is not a de Polignac number, because 161506057 - 2¹⁵ = 161473289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161506097) 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, 56218 + ... + 59020.

It is an arithmetic number, because the mean of its divisors is an integer number (20379472).

Almost surely, 2^161506057 is an apocalyptic number.

It is an amenable number.

161506057 is a deficient number, since it is larger than the sum of its proper divisors (1529719).

161506057 is a wasteful number, since it uses less digits than its factorization.

161506057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 161506057 is about 12708.5033343821. The cubic root of 161506057 is about 544.5815681159.

The spelling of 161506057 in words is "one hundred sixty-one million, five hundred six thousand, fifty-seven".