71018775749 has 2 divisors, whose sum is σ = 71018775750. Its totient is φ = 71018775748.

The previous prime is 71018775743. The next prime is 71018775767. The reversal of 71018775749 is 94757781017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51793566724 + 19225209025 = 227582^2 + 138655^2 .

It is a cyclic number.

It is not a de Polignac number, because 71018775749 - 2²⁰ = 71017727173 is a prime.

It is a super-2 number, since 2×71018775749² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71018775694 and 71018775703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71018775743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35509387874 + 35509387875.

It is an arithmetic number, because the mean of its divisors is an integer number (35509387875).

Almost surely, 2^71018775749 is an apocalyptic number.

It is an amenable number.

71018775749 is a deficient number, since it is larger than the sum of its proper divisors (1).

71018775749 is an equidigital number, since it uses as much as digits as its factorization.

71018775749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3457440, while the sum is 56.

The spelling of 71018775749 in words is "seventy-one billion, eighteen million, seven hundred seventy-five thousand, seven hundred forty-nine".