5128690665 has 32 divisors (see below), whose sum is σ = 9496903680.
Its totient is φ = 2314862784.
The previous prime is 5128690663. The next prime is 5128690681. The reversal of 5128690665 is 5660968215.
It is not a de Polignac number, because 5128690665 - 21 = 5128690663 is a prime.
It is not an unprimeable number, because it can be changed into a prime (5128690663) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 300849 + ... + 317438.
It is an arithmetic number, because the mean of its divisors is an integer number (296778240).
Almost surely, 25128690665 is an apocalyptic number.
It is an amenable number.
5128690665 is a deficient number, since it is larger than the sum of its proper divisors (4368213015).
5128690665 is a wasteful number, since it uses less digits than its factorization.
5128690665 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 618381.
The product of its (nonzero) digits is 777600, while the sum is 48.
The square root of 5128690665 is about 71614.8773998811.
The cubic root of 5128690665 is about 1724.5223815267.
The spelling of 5128690665 in words is "five billion, one hundred twenty-eight million, six hundred ninety thousand, six hundred sixty-five".