161353651042 has 4 divisors (see below), whose sum is σ = 242030476566. Its totient is φ = 80676825520.

The previous prime is 161353650989. The next prime is 161353651049. The reversal of 161353651042 is 240156353161.

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

It can be written as a sum of positive squares in only one way, i.e., 156951461241 + 4402189801 = 396171^2 + 66349^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161353650992 and 161353651010.

It is not an unprimeable number, because it can be changed into a prime (161353651049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40338412759 + ... + 40338412762.

Almost surely, 2^161353651042 is an apocalyptic number.

161353651042 is a deficient number, since it is larger than the sum of its proper divisors (80676825524).

161353651042 is an equidigital number, since it uses as much as digits as its factorization.

161353651042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80676825523.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 161353651042 in words is "one hundred sixty-one billion, three hundred fifty-three million, six hundred fifty-one thousand, forty-two".