161783772547 has 2 divisors, whose sum is σ = 161783772548. Its totient is φ = 161783772546.

The previous prime is 161783772529. The next prime is 161783772659. The reversal of 161783772547 is 745277387161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161783772547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161783772491 and 161783772500.

It is not a weakly prime, because it can be changed into another prime (161783772047) 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 as a sum of consecutive naturals, namely, 80891886273 + 80891886274.

It is an arithmetic number, because the mean of its divisors is an integer number (80891886274).

Almost surely, 2^161783772547 is an apocalyptic number.

161783772547 is a deficient number, since it is larger than the sum of its proper divisors (1).

161783772547 is an equidigital number, since it uses as much as digits as its factorization.

161783772547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13829760, while the sum is 58.

The spelling of 161783772547 in words is "one hundred sixty-one billion, seven hundred eighty-three million, seven hundred seventy-two thousand, five hundred forty-seven".