161794631777 has 8 divisors (see below), whose sum is σ = 171326027016. Its totient is φ = 152264799232.

The previous prime is 161794631723. The next prime is 161794631839. The reversal of 161794631777 is 777136497161.

It can be written as a sum of positive squares in 4 ways, for example, as 23556417361 + 138238214416 = 153481^2 + 371804^2 .

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

It is not a de Polignac number, because 161794631777 - 2⁸ = 161794631521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161794631707) 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, 174068 + ... + 594885.

It is an arithmetic number, because the mean of its divisors is an integer number (21415753377).

Almost surely, 2^161794631777 is an apocalyptic number.

161794631777 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161794631777 is a deficient number, since it is larger than the sum of its proper divisors (9531395239).

161794631777 is a wasteful number, since it uses less digits than its factorization.

161794631777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781347.

The product of its digits is 9335088, while the sum is 59.

The spelling of 161794631777 in words is "one hundred sixty-one billion, seven hundred ninety-four million, six hundred thirty-one thousand, seven hundred seventy-seven".