161345634977 has 4 divisors (see below), whose sum is σ = 161381014596. Its totient is φ = 161310255360.

The previous prime is 161345634973. The next prime is 161345634991. The reversal of 161345634977 is 779436543161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 64027217296 + 97318417681 = 253036^2 + 311959^2 .

It is a cyclic number.

It is not a de Polignac number, because 161345634977 - 2² = 161345634973 is a prime.

It is a super-2 number, since 2×161345634977² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161345634973) 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, 17682968 + ... + 17692089.

It is an arithmetic number, because the mean of its divisors is an integer number (40345253649).

Almost surely, 2^161345634977 is an apocalyptic number.

It is an amenable number.

161345634977 is a deficient number, since it is larger than the sum of its proper divisors (35379619).

161345634977 is an equidigital number, since it uses as much as digits as its factorization.

161345634977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35379618.

The product of its digits is 11430720, while the sum is 56.

The spelling of 161345634977 in words is "one hundred sixty-one billion, three hundred forty-five million, six hundred thirty-four thousand, nine hundred seventy-seven".