51203203145 has 4 divisors (see below), whose sum is σ = 61443843780. Its totient is φ = 40962562512.

The previous prime is 51203203141. The next prime is 51203203187. The reversal of 51203203145 is 54130230215.

It is a happy number.

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 6009970576 + 45193232569 = 77524^2 + 212587^2 .

It is a cyclic number.

It is not a de Polignac number, because 51203203145 - 2² = 51203203141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51203203141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5120320310 + ... + 5120320319.

It is an arithmetic number, because the mean of its divisors is an integer number (15360960945).

Almost surely, 2^51203203145 is an apocalyptic number.

It is an amenable number.

51203203145 is a deficient number, since it is larger than the sum of its proper divisors (10240640635).

51203203145 is a wasteful number, since it uses less digits than its factorization.

51203203145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10240640634.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 51203203145 in words is "fifty-one billion, two hundred three million, two hundred three thousand, one hundred forty-five".