51137642661725 has 6 divisors (see below), whose sum is σ = 63410676900570. Its totient is φ = 40910114129360.

The previous prime is 51137642661691. The next prime is 51137642661761. The reversal of 51137642661725 is 52716624673115.

It can be written as a sum of positive squares in 3 ways, for example, as 4468919896324 + 46668722765401 = 2113982^2 + 6831451^2 .

It is not a de Polignac number, because 51137642661725 - 2¹⁶ = 51137642596189 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022752853210 + ... + 1022752853259.

It is an arithmetic number, because the mean of its divisors is an integer number (10568446150095).

Almost surely, 2^{51137642661725} is an apocalyptic number.

It is an amenable number.

51137642661725 is a deficient number, since it is larger than the sum of its proper divisors (12273034238845).

51137642661725 is a wasteful number, since it uses less digits than its factorization.

51137642661725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045505706479 (or 2045505706474 counting only the distinct ones).

The product of its digits is 12700800, while the sum is 56.

The spelling of 51137642661725 in words is "fifty-one trillion, one hundred thirty-seven billion, six hundred forty-two million, six hundred sixty-one thousand, seven hundred twenty-five".