51111655100005 has 4 divisors (see below), whose sum is σ = 61333986120012. Its totient is φ = 40889324080000.

The previous prime is 51111655099991. The next prime is 51111655100021. The reversal of 51111655100005 is 50000155611115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23609035541569 + 27502619558436 = 4858913^2 + 5244294^2 .

It is not a de Polignac number, because 51111655100005 - 2¹³ = 51111655091813 is a prime.

It is a super-2 number, since 2×51111655100005² (a number of 28 digits) contains 22 as substring.

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 51111655100005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5111165509996 + ... + 5111165510005.

It is an arithmetic number, because the mean of its divisors is an integer number (15333496530003).

Almost surely, 2^{51111655100005} is an apocalyptic number.

It is an amenable number.

51111655100005 is a deficient number, since it is larger than the sum of its proper divisors (10222331020007).

51111655100005 is a wasteful number, since it uses less digits than its factorization.

51111655100005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222331020006.

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 51111655100005 in words is "fifty-one trillion, one hundred eleven billion, six hundred fifty-five million, one hundred thousand, five".