161631235442 has 8 divisors (see below), whose sum is σ = 242589558000. Its totient is φ = 80768049444.

The previous prime is 161631235429. The next prime is 161631235477. The reversal of 161631235442 is 244532136161.

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

It is a super-2 number, since 2×161631235442² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161631235396 and 161631235405.

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, 23779892 + ... + 23786687.

It is an arithmetic number, because the mean of its divisors is an integer number (30323694750).

Almost surely, 2^161631235442 is an apocalyptic number.

161631235442 is a deficient number, since it is larger than the sum of its proper divisors (80958322558).

161631235442 is a wasteful number, since it uses less digits than its factorization.

161631235442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47568280.

The product of its digits is 103680, while the sum is 38.

The spelling of 161631235442 in words is "one hundred sixty-one billion, six hundred thirty-one million, two hundred thirty-five thousand, four hundred forty-two".