1247943792099 has 4 divisors (see below), whose sum is σ = 1663925056136. Its totient is φ = 831962528064.

The previous prime is 1247943792077. The next prime is 1247943792113. The reversal of 1247943792099 is 9902973497421.

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

It is not a de Polignac number, because 1247943792099 - 2¹³ = 1247943783907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1247943792299) 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, 207990632014 + ... + 207990632019.

It is an arithmetic number, because the mean of its divisors is an integer number (415981264034).

Almost surely, 2^{1247943792099} is an apocalyptic number.

1247943792099 is a deficient number, since it is larger than the sum of its proper divisors (415981264037).

1247943792099 is an equidigital number, since it uses as much as digits as its factorization.

1247943792099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415981264036.

The product of its (nonzero) digits is 61725888, while the sum is 66.

The spelling of 1247943792099 in words is "one trillion, two hundred forty-seven billion, nine hundred forty-three million, seven hundred ninety-two thousand, ninety-nine".