863455640661 has 80 divisors (see below), whose sum is σ = 1363472140800. Its totient is φ = 543043857312.

The previous prime is 863455640659. The next prime is 863455640687. The reversal of 863455640661 is 166046554368.

863455640661 is a `hidden beast` number, since 86 + 3 + 4 + 556 + 4 + 0 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 863455640661 - 2¹ = 863455640659 is a prime.

It is a super-3 number, since 3×863455640661³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 863455640598 and 863455640607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863455640611) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 530703330 + ... + 530704956.

It is an arithmetic number, because the mean of its divisors is an integer number (17043401760).

Almost surely, 2^863455640661 is an apocalyptic number.

863455640661 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

863455640661 is a deficient number, since it is larger than the sum of its proper divisors (500016500139).

863455640661 is a wasteful number, since it uses less digits than its factorization.

863455640661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900 (or 2891 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 863455640661 in words is "eight hundred sixty-three billion, four hundred fifty-five million, six hundred forty thousand, six hundred sixty-one".