991599059258 has 16 divisors (see below), whose sum is σ = 1502894178240. Its totient is φ = 490635432576.

The previous prime is 991599059257. The next prime is 991599059267. The reversal of 991599059258 is 852950995199.

It is a junction number, because it is equal to n+sod(n) for n = 991599059191 and 991599059200.

It is not an unprimeable number, because it can be changed into a prime (991599059257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1565753 + ... + 2105891.

It is an arithmetic number, because the mean of its divisors is an integer number (93930886140).

Almost surely, 2^991599059258 is an apocalyptic number.

991599059258 is a deficient number, since it is larger than the sum of its proper divisors (511295118982).

991599059258 is a wasteful number, since it uses less digits than its factorization.

991599059258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549701.

The product of its (nonzero) digits is 118098000, while the sum is 71.

The spelling of 991599059258 in words is "nine hundred ninety-one billion, five hundred ninety-nine million, fifty-nine thousand, two hundred fifty-eight".