161751572785 has 8 divisors (see below), whose sum is σ = 211747513536. Its totient is φ = 117637507440.

The previous prime is 161751572701. The next prime is 161751572797. The reversal of 161751572785 is 587275157161.

It is a happy number.

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

It is not a de Polignac number, because 161751572785 - 2¹⁵ = 161751540017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55), and also a Moran number because the ratio is a prime number: 2940937687 = 161751572785 / (1 + 6 + 1 + 7 + 5 + 1 + 5 + 7 + 2 + 7 + 8 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1470468789 + ... + 1470468898.

It is an arithmetic number, because the mean of its divisors is an integer number (26468439192).

Almost surely, 2^161751572785 is an apocalyptic number.

It is an amenable number.

161751572785 is a deficient number, since it is larger than the sum of its proper divisors (49995940751).

161751572785 is a wasteful number, since it uses less digits than its factorization.

161751572785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940937703.

The product of its digits is 4116000, while the sum is 55.

The spelling of 161751572785 in words is "one hundred sixty-one billion, seven hundred fifty-one million, five hundred seventy-two thousand, seven hundred eighty-five".