791810503138 has 4 divisors (see below), whose sum is σ = 1187715754710. Its totient is φ = 395905251568.

The previous prime is 791810503091. The next prime is 791810503147. The reversal of 791810503138 is 831305018197.

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., 739519162209 + 52291340929 = 859953^2 + 228673^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197952625783 + ... + 197952625786.

Almost surely, 2^791810503138 is an apocalyptic number.

791810503138 is a deficient number, since it is larger than the sum of its proper divisors (395905251572).

791810503138 is a wasteful number, since it uses less digits than its factorization.

791810503138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395905251571.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 791810503138 in words is "seven hundred ninety-one billion, eight hundred ten million, five hundred three thousand, one hundred thirty-eight".