63771641 has 4 divisors (see below), whose sum is σ = 67522932. Its totient is φ = 60020352.

The previous prime is 63771637. The next prime is 63771737. The reversal of 63771641 is 14617736.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30085225 + 33686416 = 5485^2 + 5804^2 .

It is a cyclic number.

It is not a de Polignac number, because 63771641 - 2² = 63771637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63771601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875620 + ... + 1875653.

It is an arithmetic number, because the mean of its divisors is an integer number (16880733).

Almost surely, 2^63771641 is an apocalyptic number.

It is an amenable number.

63771641 is a deficient number, since it is larger than the sum of its proper divisors (3751291).

63771641 is a wasteful number, since it uses less digits than its factorization.

63771641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751290.

The product of its digits is 21168, while the sum is 35.

The square root of 63771641 is about 7985.7148083312. The cubic root of 63771641 is about 399.5236851188.

The spelling of 63771641 in words is "sixty-three million, seven hundred seventy-one thousand, six hundred forty-one".