51505045163554 has 4 divisors (see below), whose sum is σ = 77257567745334. Its totient is φ = 25752522581776.

The previous prime is 51505045163519. The next prime is 51505045163581. The reversal of 51505045163554 is 45536154050515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 41914967827329 + 9590077336225 = 6474177^2 + 3096785^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51505045163498 and 51505045163507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12876261290887 + ... + 12876261290890.

Almost surely, 2^{51505045163554} is an apocalyptic number.

51505045163554 is a deficient number, since it is larger than the sum of its proper divisors (25752522581780).

51505045163554 is a wasteful number, since it uses less digits than its factorization.

51505045163554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25752522581779.

The product of its (nonzero) digits is 4500000, while the sum is 49.

The spelling of 51505045163554 in words is "fifty-one trillion, five hundred five billion, forty-five million, one hundred sixty-three thousand, five hundred fifty-four".