161793837487 has 4 divisors (see below), whose sum is σ = 161801128440. Its totient is φ = 161786546536.

The previous prime is 161793837449. The next prime is 161793837509. The reversal of 161793837487 is 784738397161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161793837487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161793837427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3612088 + ... + 3656605.

It is an arithmetic number, because the mean of its divisors is an integer number (40450282110).

Almost surely, 2^161793837487 is an apocalyptic number.

161793837487 is a deficient number, since it is larger than the sum of its proper divisors (7290953).

161793837487 is an equidigital number, since it uses as much as digits as its factorization.

161793837487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7290952.

The product of its digits is 42674688, while the sum is 64.

The spelling of 161793837487 in words is "one hundred sixty-one billion, seven hundred ninety-three million, eight hundred thirty-seven thousand, four hundred eighty-seven".