161551614651 has 8 divisors (see below), whose sum is σ = 246173889024. Its totient is φ = 92315208360.

The previous prime is 161551614647. The next prime is 161551614661. The reversal of 161551614651 is 156416155161.

161551614651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 161551614651 - 2² = 161551614647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161551614661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3846466995 + ... + 3846467036.

It is an arithmetic number, because the mean of its divisors is an integer number (30771736128).

Almost surely, 2^161551614651 is an apocalyptic number.

161551614651 is a deficient number, since it is larger than the sum of its proper divisors (84622274373).

161551614651 is an equidigital number, since it uses as much as digits as its factorization.

161551614651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692934041.

The product of its digits is 108000, while the sum is 42.

The spelling of 161551614651 in words is "one hundred sixty-one billion, five hundred fifty-one million, six hundred fourteen thousand, six hundred fifty-one".