51505045163555 has 8 divisors (see below), whose sum is σ = 61880789454192. Its totient is φ = 41154212625568.

The previous prime is 51505045163519. The next prime is 51505045163581. The reversal of 51505045163555 is 55536154050515.

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

It is a cyclic number.

It is not a de Polignac number, because 51505045163555 - 2¹⁶ = 51505045098019 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, 6227933612 + ... + 6227941881.

It is an arithmetic number, because the mean of its divisors is an integer number (7735098681774).

Almost surely, 2^{51505045163555} is an apocalyptic number.

51505045163555 is a deficient number, since it is larger than the sum of its proper divisors (10375744290637).

51505045163555 is a wasteful number, since it uses less digits than its factorization.

51505045163555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12455876325.

The product of its (nonzero) digits is 5625000, while the sum is 50.

The spelling of 51505045163555 in words is "fifty-one trillion, five hundred five billion, forty-five million, one hundred sixty-three thousand, five hundred fifty-five".