163861651 has 2 divisors, whose sum is σ = 163861652. Its totient is φ = 163861650.

The previous prime is 163861627. The next prime is 163861661. The reversal of 163861651 is 156168361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163861651 - 2¹⁷ = 163730579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 163861651.

It is not a weakly prime, because it can be changed into another prime (163861661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81930825 + 81930826.

It is an arithmetic number, because the mean of its divisors is an integer number (81930826).

Almost surely, 2^163861651 is an apocalyptic number.

163861651 is a deficient number, since it is larger than the sum of its proper divisors (1).

163861651 is an equidigital number, since it uses as much as digits as its factorization.

163861651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 163861651 is about 12800.8457142487. The cubic root of 163861651 is about 547.2164051882.

The spelling of 163861651 in words is "one hundred sixty-three million, eight hundred sixty-one thousand, six hundred fifty-one".