161572068785 has 8 divisors (see below), whose sum is σ = 193917796800. Its totient is φ = 129236778864.

The previous prime is 161572068781. The next prime is 161572068787. The reversal of 161572068785 is 587860275161.

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 161572068785 - 2² = 161572068781 is a prime.

It is a super-2 number, since 2×161572068785² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161572068785.

It is not an unprimeable number, because it can be changed into a prime (161572068781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2575427 + ... + 2637416.

It is an arithmetic number, because the mean of its divisors is an integer number (24239724600).

Almost surely, 2^161572068785 is an apocalyptic number.

It is an amenable number.

161572068785 is a deficient number, since it is larger than the sum of its proper divisors (32345728015).

161572068785 is an equidigital number, since it uses as much as digits as its factorization.

161572068785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219047.

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 161572068785 in words is "one hundred sixty-one billion, five hundred seventy-two million, sixty-eight thousand, seven hundred eighty-five".