63261666 has 48 divisors (see below), whose sum is σ = 148195320. Its totient is φ = 19388160.

The previous prime is 63261637. The next prime is 63261689. The reversal of 63261666 is 66616236.

It can be written as a sum of positive squares in 4 ways, for example, as 61074225 + 2187441 = 7815^2 + 1479^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 63261666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95376 + ... + 96036.

Almost surely, 2^63261666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63261666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74097660).

63261666 is an abundant number, since it is smaller than the sum of its proper divisors (84933654).

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

63261666 is a wasteful number, since it uses less digits than its factorization.

63261666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1088 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 63261666 is about 7953.7202616134. The cubic root of 63261666 is about 398.4558508457.

The spelling of 63261666 in words is "sixty-three million, two hundred sixty-one thousand, six hundred sixty-six".