51001105515506 has 4 divisors (see below), whose sum is σ = 76501658273262. Its totient is φ = 25500552757752.

The previous prime is 51001105515469. The next prime is 51001105515541. The reversal of 51001105515506 is 60551550110015.

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., 42494870778481 + 8506234737025 = 6518809^2 + 2916545^2 .

It is a super-2 number, since 2×51001105515506² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750276378875 + ... + 12750276378878.

Almost surely, 2^{51001105515506} is an apocalyptic number.

51001105515506 is a deficient number, since it is larger than the sum of its proper divisors (25500552757756).

51001105515506 is a wasteful number, since it uses less digits than its factorization.

51001105515506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25500552757755.

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 51001105515506 in words is "fifty-one trillion, one billion, one hundred five million, five hundred fifteen thousand, five hundred six".