51213675549205 has 8 divisors (see below), whose sum is σ = 66183826863672. Its totient is φ = 37819329636288.

The previous prime is 51213675549199. The next prime is 51213675549217. The reversal of 51213675549205 is 50294557631215.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5289443414641 + 45924232134564 = 2299879^2 + 6776742^2 .

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 51213675549205 - 2¹⁹ = 51213675024917 is a prime.

It is a super-2 number, since 2×51213675549205² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393951350314 + ... + 393951350443.

It is an arithmetic number, because the mean of its divisors is an integer number (8272978357959).

Almost surely, 2^{51213675549205} is an apocalyptic number.

It is an amenable number.

51213675549205 is a deficient number, since it is larger than the sum of its proper divisors (14970151314467).

51213675549205 is a wasteful number, since it uses less digits than its factorization.

51213675549205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787902700775.

The product of its (nonzero) digits is 11340000, while the sum is 55.

The spelling of 51213675549205 in words is "fifty-one trillion, two hundred thirteen billion, six hundred seventy-five million, five hundred forty-nine thousand, two hundred five".