161541340651 has 8 divisors (see below), whose sum is σ = 171115113600. Its totient is φ = 151975494528.

The previous prime is 161541340643. The next prime is 161541340691. The reversal of 161541340651 is 156043145161.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 161541340651 - 2³ = 161541340643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161541340651.

It is not an unprimeable number, because it can be changed into a prime (161541340691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1939716 + ... + 2021281.

It is an arithmetic number, because the mean of its divisors is an integer number (21389389200).

Almost surely, 2^161541340651 is an apocalyptic number.

161541340651 is a deficient number, since it is larger than the sum of its proper divisors (9573772949).

161541340651 is a wasteful number, since it uses less digits than its factorization.

161541340651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3963413.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 161541340651 in words is "one hundred sixty-one billion, five hundred forty-one million, three hundred forty thousand, six hundred fifty-one".