51000505109990 has 16 divisors (see below), whose sum is σ = 91850238038160. Its totient is φ = 20389240079520.

The previous prime is 51000505109987. The next prime is 51000505109993. The reversal of 51000505109990 is 9990150500015.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51000505109987) and next prime (51000505109993).

It is a super-2 number, since 2×51000505109990² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000505109993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1370226020 + ... + 1370263239.

It is an arithmetic number, because the mean of its divisors is an integer number (5740639877385).

Almost surely, 2^{51000505109990} is an apocalyptic number.

51000505109990 is a deficient number, since it is larger than the sum of its proper divisors (40849732928170).

51000505109990 is a wasteful number, since it uses less digits than its factorization.

51000505109990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740491127.

The product of its (nonzero) digits is 91125, while the sum is 44.

The spelling of 51000505109990 in words is "fifty-one trillion, five hundred five million, one hundred nine thousand, nine hundred ninety".