71751557787 has 16 divisors (see below), whose sum is σ = 117746146560. Its totient is φ = 37846975392.

The previous prime is 71751557777. The next prime is 71751557789. The reversal of 71751557787 is 78775515717.

It is a happy number.

It is not a de Polignac number, because 71751557787 - 2¹² = 71751553691 is a prime.

It is a super-2 number, since 2×71751557787² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71751557787.

It is not an unprimeable number, because it can be changed into a prime (71751557789) 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 in 15 ways as a sum of consecutive naturals, for example, 131412837 + ... + 131413382.

It is an arithmetic number, because the mean of its divisors is an integer number (7359134160).

Almost surely, 2^71751557787 is an apocalyptic number.

71751557787 is a deficient number, since it is larger than the sum of its proper divisors (45994588773).

71751557787 is a wasteful number, since it uses less digits than its factorization.

71751557787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262826242.

The product of its digits is 16807000, while the sum is 60.

The spelling of 71751557787 in words is "seventy-one billion, seven hundred fifty-one million, five hundred fifty-seven thousand, seven hundred eighty-seven".