161635016391 has 8 divisors (see below), whose sum is σ = 219166124160. Its totient is φ = 105930293112.

The previous prime is 161635016383. The next prime is 161635016399. The reversal of 161635016391 is 193610536161.

It is a happy number.

161635016391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161635016383) and next prime (161635016399).

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

It is not a de Polignac number, because 161635016391 - 2³ = 161635016383 is a prime.

It is a super-2 number, since 2×161635016391² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161635016399) 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, 456595915 + ... + 456596268.

It is an arithmetic number, because the mean of its divisors is an integer number (27395765520).

Almost surely, 2^161635016391 is an apocalyptic number.

161635016391 is a deficient number, since it is larger than the sum of its proper divisors (57531107769).

161635016391 is an equidigital number, since it uses as much as digits as its factorization.

161635016391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913192245.

The product of its (nonzero) digits is 87480, while the sum is 42.

The spelling of 161635016391 in words is "one hundred sixty-one billion, six hundred thirty-five million, sixteen thousand, three hundred ninety-one".