63431661 has 8 divisors (see below), whose sum is σ = 85065120. Its totient is φ = 42042992.

The previous prime is 63431659. The next prime is 63431689. The reversal of 63431661 is 16613436.

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 63431661 - 2¹ = 63431659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63431651) 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, 60591 + ... + 61628.

It is an arithmetic number, because the mean of its divisors is an integer number (10633140).

Almost surely, 2^63431661 is an apocalyptic number.

It is an amenable number.

63431661 is a deficient number, since it is larger than the sum of its proper divisors (21633459).

63431661 is a wasteful number, since it uses less digits than its factorization.

63431661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122395.

The product of its digits is 7776, while the sum is 30.

The square root of 63431661 is about 7964.3996007232. The cubic root of 63431661 is about 398.8124381480.

The spelling of 63431661 in words is "sixty-three million, four hundred thirty-one thousand, six hundred sixty-one".