86661939402 has 48 divisors (see below), whose sum is σ = 194385358440. Its totient is φ = 27870654336.

The previous prime is 86661939379. The next prime is 86661939409. The reversal of 86661939402 is 20493916668.

It can be written as a sum of positive squares in 4 ways, for example, as 86660173161 + 1766241 = 294381^2 + 1329^2 .

It is not an unprimeable number, because it can be changed into a prime (86661939409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 656248 + ... + 777164.

Almost surely, 2^86661939402 is an apocalyptic number.

86661939402 is an abundant number, since it is smaller than the sum of its proper divisors (107723419038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86661939402 is a wasteful number, since it uses less digits than its factorization.

86661939402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122327 (or 122324 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

Adding to 86661939402 its sum of digits (54), we get a square (86661939456 = 294384²).

The spelling of 86661939402 in words is "eighty-six billion, six hundred sixty-one million, nine hundred thirty-nine thousand, four hundred two".