161401672651 has 8 divisors (see below), whose sum is σ = 166986010800. Its totient is φ = 155818585440.

The previous prime is 161401672637. The next prime is 161401672657. The reversal of 161401672651 is 156276104161.

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 161401672651 - 2²⁷ = 161267454923 is a prime.

It is a super-2 number, since 2×161401672651² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161401672657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46365 + ... + 570046.

It is an arithmetic number, because the mean of its divisors is an integer number (20873251350).

Almost surely, 2^161401672651 is an apocalyptic number.

161401672651 is a deficient number, since it is larger than the sum of its proper divisors (5584338149).

161401672651 is an equidigital number, since it uses as much as digits as its factorization.

161401672651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625469.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 161401672651 in words is "one hundred sixty-one billion, four hundred one million, six hundred seventy-two thousand, six hundred fifty-one".