51153126205 has 4 divisors (see below), whose sum is σ = 61383751452. Its totient is φ = 40922500960.

The previous prime is 51153126197. The next prime is 51153126221. The reversal of 51153126205 is 50262135115.

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 36274249764 + 14878876441 = 190458^2 + 121979^2 .

It is not a de Polignac number, because 51153126205 - 2³ = 51153126197 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 3 ways as a sum of consecutive naturals, for example, 5115312616 + ... + 5115312625.

It is an arithmetic number, because the mean of its divisors is an integer number (15345937863).

Almost surely, 2^51153126205 is an apocalyptic number.

It is an amenable number.

51153126205 is a deficient number, since it is larger than the sum of its proper divisors (10230625247).

51153126205 is a wasteful number, since it uses less digits than its factorization.

51153126205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10230625246.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 51153126205 in words is "fifty-one billion, one hundred fifty-three million, one hundred twenty-six thousand, two hundred five".