63171966 has 128 divisors (see below), whose sum is σ = 161989632. Its totient is φ = 16128000.

The previous prime is 63171943. The next prime is 63171971. The reversal of 63171966 is 66917136.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 889711 + ... + 889781.

It is an arithmetic number, because the mean of its divisors is an integer number (1265544).

Almost surely, 2^63171966 is an apocalyptic number.

63171966 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 63171966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80994816).

63171966 is an abundant number, since it is smaller than the sum of its proper divisors (98817666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63171966 is a wasteful number, since it uses less digits than its factorization.

63171966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178.

The product of its digits is 40824, while the sum is 39.

The square root of 63171966 is about 7948.0793906453. The cubic root of 63171966 is about 398.2674355527.

The spelling of 63171966 in words is "sixty-three million, one hundred seventy-one thousand, nine hundred sixty-six".