163978711 has 8 divisors (see below), whose sum is σ = 177153984. Its totient is φ = 150883680.

The previous prime is 163978693. The next prime is 163978729. The reversal of 163978711 is 117879361.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (163978693) and next prime (163978729).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163978711 - 2⁵ = 163978679 is a prime.

It is a super-2 number, since 2×163978711² = 53778035322443042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163978751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15775 + ... + 24016.

It is an arithmetic number, because the mean of its divisors is an integer number (22144248).

Almost surely, 2^163978711 is an apocalyptic number.

163978711 is a deficient number, since it is larger than the sum of its proper divisors (13175273).

163978711 is a wasteful number, since it uses less digits than its factorization.

163978711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40121.

The product of its digits is 63504, while the sum is 43.

The square root of 163978711 is about 12805.4172520852. The cubic root of 163978711 is about 547.3466815611.

The spelling of 163978711 in words is "one hundred sixty-three million, nine hundred seventy-eight thousand, seven hundred eleven".