76861661455809 has 48 divisors (see below), whose sum is σ = 115193241363200. Its totient is φ = 51214901565456.

The previous prime is 76861661455801. The next prime is 76861661455847. The reversal of 76861661455809 is 90855416616867.

76861661455809 is a `hidden beast` number, since 7 + 6 + 8 + 6 + 1 + 6 + 61 + 4 + 558 + 0 + 9 = 666.

It is not a de Polignac number, because 76861661455809 - 2³ = 76861661455801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76861661455801) 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, 4921028202 + ... + 4921043820.

Almost surely, 2^{76861661455809} is an apocalyptic number.

It is an amenable number.

76861661455809 is a deficient number, since it is larger than the sum of its proper divisors (38331579907391).

76861661455809 is a wasteful number, since it uses less digits than its factorization.

76861661455809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24696 (or 24684 counting only the distinct ones).

The product of its (nonzero) digits is 522547200, while the sum is 72.

The spelling of 76861661455809 in words is "seventy-six trillion, eight hundred sixty-one billion, six hundred sixty-one million, four hundred fifty-five thousand, eight hundred nine".