161615647 has 2 divisors, whose sum is σ = 161615648. Its totient is φ = 161615646.

The previous prime is 161615639. The next prime is 161615669. The reversal of 161615647 is 746516161.

161615647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (746516161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161615647 - 2³ = 161615639 is a prime.

It is a super-2 number, since 2×161615647² = 52239234710457218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161615747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80807823 + 80807824.

It is an arithmetic number, because the mean of its divisors is an integer number (80807824).

Almost surely, 2^161615647 is an apocalyptic number.

161615647 is a deficient number, since it is larger than the sum of its proper divisors (1).

161615647 is an equidigital number, since it uses as much as digits as its factorization.

161615647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 161615647 is about 12712.8142832341. The cubic root of 161615647 is about 544.7047156136.

The spelling of 161615647 in words is "one hundred sixty-one million, six hundred fifteen thousand, six hundred forty-seven".