161109419542 has 8 divisors (see below), whose sum is σ = 241666495632. Its totient is φ = 80553921000.

The previous prime is 161109419531. The next prime is 161109419551. The reversal of 161109419542 is 245914901161.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93009 + ... + 575212.

It is an arithmetic number, because the mean of its divisors is an integer number (30208311954).

Almost surely, 2^161109419542 is an apocalyptic number.

161109419542 is a deficient number, since it is larger than the sum of its proper divisors (80557076090).

161109419542 is a wasteful number, since it uses less digits than its factorization.

161109419542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788774.

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 161109419542 in words is "one hundred sixty-one billion, one hundred nine million, four hundred nineteen thousand, five hundred forty-two".