161215204647 has 32 divisors (see below), whose sum is σ = 249717473280. Its totient is φ = 90610771680.

The previous prime is 161215204637. The next prime is 161215204679. The reversal of 161215204647 is 746402512161.

It is not a de Polignac number, because 161215204647 - 2¹² = 161215200551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161215204637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251572 + ... + 621062.

It is an arithmetic number, because the mean of its divisors is an integer number (7803671040).

Almost surely, 2^161215204647 is an apocalyptic number.

161215204647 is a deficient number, since it is larger than the sum of its proper divisors (88502268633).

161215204647 is a wasteful number, since it uses less digits than its factorization.

161215204647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369843.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 161215204647 in words is "one hundred sixty-one billion, two hundred fifteen million, two hundred four thousand, six hundred forty-seven".