861083257499 has 4 divisors (see below), whose sum is σ = 861151898664. Its totient is φ = 861014616336.

The previous prime is 861083257483. The next prime is 861083257519. The reversal of 861083257499 is 994752380168.

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 861083257499 - 2⁴ = 861083257483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861083257469) 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, 34301762 + ... + 34326855.

It is an arithmetic number, because the mean of its divisors is an integer number (215287974666).

It is a 1-persistent number, because it is pandigital, but 2⋅861083257499 = 1722166514998 is not.

Almost surely, 2^861083257499 is an apocalyptic number.

861083257499 is a deficient number, since it is larger than the sum of its proper divisors (68641165).

861083257499 is a wasteful number, since it uses less digits than its factorization.

861083257499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68641164.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 861083257499 in words is "eight hundred sixty-one billion, eighty-three million, two hundred fifty-seven thousand, four hundred ninety-nine".