86378971523 has 4 divisors (see below), whose sum is σ = 93023507808. Its totient is φ = 79734435240.

The previous prime is 86378971477. The next prime is 86378971621. The reversal of 86378971523 is 32517987368.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 86378971523 - 2¹⁴ = 86378955139 is a prime.

It is a super-2 number, since 2×86378971523² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86378971123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3322268123 + ... + 3322268148.

It is an arithmetic number, because the mean of its divisors is an integer number (23255876952).

Almost surely, 2^86378971523 is an apocalyptic number.

86378971523 is a deficient number, since it is larger than the sum of its proper divisors (6644536285).

86378971523 is a wasteful number, since it uses less digits than its factorization.

86378971523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6644536284.

The product of its digits is 15240960, while the sum is 59.

The spelling of 86378971523 in words is "eighty-six billion, three hundred seventy-eight million, nine hundred seventy-one thousand, five hundred twenty-three".