51011106055561 has 8 divisors (see below), whose sum is σ = 51193262749824. Its totient is φ = 50829261008400.

The previous prime is 51011106055541. The next prime is 51011106055573. The reversal of 51011106055561 is 16555060111015.

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 51011106055561 - 2¹¹ = 51011106053513 is a prime.

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 51011106055561.

It is not an unprimeable number, because it can be changed into a prime (51011106055541) 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, 77583825 + ... + 78238558.

It is an arithmetic number, because the mean of its divisors is an integer number (6399157843728).

Almost surely, 2^{51011106055561} is an apocalyptic number.

It is an amenable number.

51011106055561 is a deficient number, since it is larger than the sum of its proper divisors (182156694263).

51011106055561 is a wasteful number, since it uses less digits than its factorization.

51011106055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155823551.

The product of its (nonzero) digits is 22500, while the sum is 37.

Adding to 51011106055561 its reverse (16555060111015), we get a palindrome (67566166166576).

The spelling of 51011106055561 in words is "fifty-one trillion, eleven billion, one hundred six million, fifty-five thousand, five hundred sixty-one".