86961657861 has 32 divisors (see below), whose sum is σ = 138797245440. Its totient is φ = 53493652800.

The previous prime is 86961657817. The next prime is 86961657877. The reversal of 86961657861 is 16875616968.

86961657861 is a `hidden beast` number, since 8 + 6 + 9 + 616 + 5 + 7 + 8 + 6 + 1 = 666.

It is not a de Polignac number, because 86961657861 - 2¹¹ = 86961655813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86961657661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 861631 + ... + 957251.

It is an arithmetic number, because the mean of its divisors is an integer number (4337413920).

Almost surely, 2^86961657861 is an apocalyptic number.

It is an amenable number.

86961657861 is a deficient number, since it is larger than the sum of its proper divisors (51835587579).

86961657861 is a wasteful number, since it uses less digits than its factorization.

86961657861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98234 (or 98228 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 86961657861 in words is "eighty-six billion, nine hundred sixty-one million, six hundred fifty-seven thousand, eight hundred sixty-one".