161770517187 has 8 divisors (see below), whose sum is σ = 215697475920. Its totient is φ = 107845284960.

The previous prime is 161770517179. The next prime is 161770517197. The reversal of 161770517187 is 781715077161.

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

It is not a de Polignac number, because 161770517187 - 2³ = 161770517179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161770517137) 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, 194364 + ... + 601097.

It is an arithmetic number, because the mean of its divisors is an integer number (26962184490).

Almost surely, 2^161770517187 is an apocalyptic number.

161770517187 is a deficient number, since it is larger than the sum of its proper divisors (53926958733).

161770517187 is an equidigital number, since it uses as much as digits as its factorization.

161770517187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863253.

The product of its (nonzero) digits is 576240, while the sum is 51.

The spelling of 161770517187 in words is "one hundred sixty-one billion, seven hundred seventy million, five hundred seventeen thousand, one hundred eighty-seven".