161783772659 has 2 divisors, whose sum is σ = 161783772660. Its totient is φ = 161783772658.

The previous prime is 161783772547. The next prime is 161783772673. The reversal of 161783772659 is 956277387161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161783772659 - 2¹² = 161783768563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (161783771659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80891886329 + 80891886330.

It is an arithmetic number, because the mean of its divisors is an integer number (80891886330).

Almost surely, 2^161783772659 is an apocalyptic number.

161783772659 is a deficient number, since it is larger than the sum of its proper divisors (1).

161783772659 is an equidigital number, since it uses as much as digits as its factorization.

161783772659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26671680, while the sum is 62.

The spelling of 161783772659 in words is "one hundred sixty-one billion, seven hundred eighty-three million, seven hundred seventy-two thousand, six hundred fifty-nine".