71161663 has 6 divisors (see below), whose sum is σ = 71642616. Its totient is φ = 70683912.

The previous prime is 71161661. The next prime is 71161681. The reversal of 71161663 is 36616117.

It is not a de Polignac number, because 71161663 - 2¹ = 71161661 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 (71161661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23206 + ... + 26092.

It is an arithmetic number, because the mean of its divisors is an integer number (11940436).

Almost surely, 2^71161663 is an apocalyptic number.

71161663 is a deficient number, since it is larger than the sum of its proper divisors (480953).

71161663 is an equidigital number, since it uses as much as digits as its factorization.

71161663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3201 (or 3044 counting only the distinct ones).

The product of its digits is 4536, while the sum is 31.

The square root of 71161663 is about 8435.7372529021. The cubic root of 71161663 is about 414.3958170017.

It can be divided in two parts, 71161 and 663, that added together give a square (71824 = 268²).

The spelling of 71161663 in words is "seventy-one million, one hundred sixty-one thousand, six hundred sixty-three".