51194808665 has 32 divisors (see below), whose sum is σ = 82484510976. Its totient is φ = 29458748160.

The previous prime is 51194808619. The next prime is 51194808667. The reversal of 51194808665 is 56680849115.

It is not a de Polignac number, because 51194808665 - 2³² = 46899841369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51194808667) 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, 5109362 + ... + 5119371.

It is an arithmetic number, because the mean of its divisors is an integer number (2577640968).

Almost surely, 2^51194808665 is an apocalyptic number.

51194808665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51194808665 is a deficient number, since it is larger than the sum of its proper divisors (31289702311).

51194808665 is a wasteful number, since it uses less digits than its factorization.

51194808665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10228769.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The spelling of 51194808665 in words is "fifty-one billion, one hundred ninety-four million, eight hundred eight thousand, six hundred sixty-five".