51135752207 has 4 divisors (see below), whose sum is σ = 51139606560. Its totient is φ = 51131897856.

The previous prime is 51135752153. The next prime is 51135752233. The reversal of 51135752207 is 70225753115.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51135752207 - 2¹⁶ = 51135686671 is a prime.

It is a super-2 number, since 2×51135752207² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51135752267) 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, 1907207 + ... + 1933832.

It is an arithmetic number, because the mean of its divisors is an integer number (12784901640).

Almost surely, 2^51135752207 is an apocalyptic number.

51135752207 is a deficient number, since it is larger than the sum of its proper divisors (3854353).

51135752207 is a wasteful number, since it uses less digits than its factorization.

51135752207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3854352.

The product of its (nonzero) digits is 73500, while the sum is 38.

The spelling of 51135752207 in words is "fifty-one billion, one hundred thirty-five million, seven hundred fifty-two thousand, two hundred seven".