51708901487 has 4 divisors (see below), whose sum is σ = 51709652616. Its totient is φ = 51708150360.

The previous prime is 51708901463. The next prime is 51708901567. The reversal of 51708901487 is 78410980715.

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 51708901487 - 2⁶ = 51708901423 is a prime.

It is a super-2 number, since 2×51708901487² (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 (51708901457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260564 + ... + 413897.

It is an arithmetic number, because the mean of its divisors is an integer number (12927413154).

Almost surely, 2^51708901487 is an apocalyptic number.

51708901487 is a deficient number, since it is larger than the sum of its proper divisors (751129).

51708901487 is an equidigital number, since it uses as much as digits as its factorization.

51708901487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751128.

The product of its (nonzero) digits is 564480, while the sum is 50.

The spelling of 51708901487 in words is "fifty-one billion, seven hundred eight million, nine hundred one thousand, four hundred eighty-seven".