51551551666503 has 20 divisors (see below), whose sum is σ = 88010409195280. Its totient is φ = 29458029523392.

The previous prime is 51551551666487. The next prime is 51551551666513. The reversal of 51551551666503 is 30566615515515.

It is not a de Polignac number, because 51551551666503 - 2⁴ = 51551551666487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51551551666503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551551666513) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45459921538 + ... + 45459922671.

It is an arithmetic number, because the mean of its divisors is an integer number (4400520459764).

Almost surely, 2^{51551551666503} is an apocalyptic number.

51551551666503 is a deficient number, since it is larger than the sum of its proper divisors (36458857528777).

51551551666503 is an equidigital number, since it uses as much as digits as its factorization.

51551551666503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90919844228 (or 90919844219 counting only the distinct ones).

The product of its (nonzero) digits is 10125000, while the sum is 54.

The spelling of 51551551666503 in words is "fifty-one trillion, five hundred fifty-one billion, five hundred fifty-one million, six hundred sixty-six thousand, five hundred three".