161801177438 has 8 divisors (see below), whose sum is σ = 242736874632. Its totient is φ = 80888885896.

The previous prime is 161801177437. The next prime is 161801177467. The reversal of 161801177438 is 834771108161.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 161801177392 and 161801177401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161801177437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5834120 + ... + 5861787.

It is an arithmetic number, because the mean of its divisors is an integer number (30342109329).

Almost surely, 2^161801177438 is an apocalyptic number.

161801177438 is a deficient number, since it is larger than the sum of its proper divisors (80935697194).

161801177438 is a wasteful number, since it uses less digits than its factorization.

161801177438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11702826.

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 161801177438 in words is "one hundred sixty-one billion, eight hundred one million, one hundred seventy-seven thousand, four hundred thirty-eight".