161783772577 has 8 divisors (see below), whose sum is σ = 185853750656. Its totient is φ = 137953297152.

The previous prime is 161783772547. The next prime is 161783772659. The reversal of 161783772577 is 775277387161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161783772577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161783772547) 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, 59874213 + ... + 59876914.

It is an arithmetic number, because the mean of its divisors is an integer number (23231718832).

Almost surely, 2^161783772577 is an apocalyptic number.

It is an amenable number.

161783772577 is a deficient number, since it is larger than the sum of its proper divisors (24069978079).

161783772577 is a wasteful number, since it uses less digits than its factorization.

161783772577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119751327.

The product of its digits is 24202080, while the sum is 61.

The spelling of 161783772577 in words is "one hundred sixty-one billion, seven hundred eighty-three million, seven hundred seventy-two thousand, five hundred seventy-seven".