51578142157 has 2 divisors, whose sum is σ = 51578142158. Its totient is φ = 51578142156.

The previous prime is 51578142131. The next prime is 51578142163. The reversal of 51578142157 is 75124187515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42741014121 + 8837128036 = 206739^2 + 94006^2 .

It is a cyclic number.

It is not a de Polignac number, because 51578142157 - 2³¹ = 49430658509 is a prime.

It is a super-2 number, since 2×51578142157² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51578122157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25789071078 + 25789071079.

It is an arithmetic number, because the mean of its divisors is an integer number (25789071079).

Almost surely, 2^51578142157 is an apocalyptic number.

It is an amenable number.

51578142157 is a deficient number, since it is larger than the sum of its proper divisors (1).

51578142157 is an equidigital number, since it uses as much as digits as its factorization.

51578142157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 392000, while the sum is 46.

The spelling of 51578142157 in words is "fifty-one billion, five hundred seventy-eight million, one hundred forty-two thousand, one hundred fifty-seven".