63861305661 has 48 divisors (see below), whose sum is σ = 102254705280. Its totient is φ = 39729761280.

The previous prime is 63861305659. The next prime is 63861305663. The reversal of 63861305661 is 16650316836.

63861305661 is a `hidden beast` number, since 6 + 3 + 86 + 1 + 3 + 0 + 566 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (63861305659) and next prime (63861305663).

It is not a de Polignac number, because 63861305661 - 2¹ = 63861305659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63861305663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89805 + ... + 368493.

It is an arithmetic number, because the mean of its divisors is an integer number (2130306360).

Almost surely, 2^63861305661 is an apocalyptic number.

It is an amenable number.

63861305661 is a deficient number, since it is larger than the sum of its proper divisors (38393399619).

63861305661 is a wasteful number, since it uses less digits than its factorization.

63861305661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278768 (or 278756 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 63861305661 in words is "sixty-three billion, eight hundred sixty-one million, three hundred five thousand, six hundred sixty-one".