161445677 has 4 divisors (see below), whose sum is σ = 162926940. Its totient is φ = 159964416.

The previous prime is 161445673. The next prime is 161445701. The reversal of 161445677 is 776544161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 776544161 = 3019 ⋅257219.

It can be written as a sum of positive squares in 2 ways, for example, as 147525316 + 13920361 = 12146^2 + 3731^2 .

It is a cyclic number.

It is not a de Polignac number, because 161445677 - 2² = 161445673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161445673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740468 + ... + 740685.

It is an arithmetic number, because the mean of its divisors is an integer number (40731735).

Almost surely, 2^161445677 is an apocalyptic number.

It is an amenable number.

161445677 is a deficient number, since it is larger than the sum of its proper divisors (1481263).

161445677 is a wasteful number, since it uses less digits than its factorization.

161445677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481262.

The product of its digits is 141120, while the sum is 41.

The square root of 161445677 is about 12706.1275375309. The cubic root of 161445677 is about 544.5136946375.

The spelling of 161445677 in words is "one hundred sixty-one million, four hundred forty-five thousand, six hundred seventy-seven".