86523747578 has 4 divisors (see below), whose sum is σ = 129785621370. Its totient is φ = 43261873788.

The previous prime is 86523747547. The next prime is 86523747581. The reversal of 86523747578 is 87574732568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 68755657369 + 17768090209 = 262213^2 + 133297^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 86523747578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21630936893 + ... + 21630936896.

Almost surely, 2^86523747578 is an apocalyptic number.

86523747578 is a deficient number, since it is larger than the sum of its proper divisors (43261873792).

86523747578 is a wasteful number, since it uses less digits than its factorization.

86523747578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43261873791.

The product of its digits is 79027200, while the sum is 62.

The spelling of 86523747578 in words is "eighty-six billion, five hundred twenty-three million, seven hundred forty-seven thousand, five hundred seventy-eight".