5191778915 has 8 divisors (see below), whose sum is σ = 6230653488. Its totient is φ = 4153077280.

The previous prime is 5191778897. The next prime is 5191778939. The reversal of 5191778915 is 5198771915.

It is a Cunningham number, because it is equal to 72054²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5191778915 - 2⁸ = 5191778659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36029 + ... + 108081.

It is an arithmetic number, because the mean of its divisors is an integer number (778831686).

Almost surely, 2^5191778915 is an apocalyptic number.

5191778915 is a deficient number, since it is larger than the sum of its proper divisors (1038874573).

5191778915 is a wasteful number, since it uses less digits than its factorization.

5191778915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86469.

The product of its digits is 793800, while the sum is 53.

The square root of 5191778915 is about 72053.9999930608. Note that the first 5 decimals coincide. The cubic root of 5191778915 is about 1731.5647258672.

The spelling of 5191778915 in words is "five billion, one hundred ninety-one million, seven hundred seventy-eight thousand, nine hundred fifteen".