71777075677 has 2 divisors, whose sum is σ = 71777075678. Its totient is φ = 71777075676.

The previous prime is 71777075663. The next prime is 71777075693. The reversal of 71777075677 is 77657077717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62665609561 + 9111466116 = 250331^2 + 95454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71777075677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71777675677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35888537838 + 35888537839.

It is an arithmetic number, because the mean of its divisors is an integer number (35888537839).

Almost surely, 2^71777075677 is an apocalyptic number.

It is an amenable number.

71777075677 is a deficient number, since it is larger than the sum of its proper divisors (1).

71777075677 is an equidigital number, since it uses as much as digits as its factorization.

71777075677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24706290, while the sum is 61.

The spelling of 71777075677 in words is "seventy-one billion, seven hundred seventy-seven million, seventy-five thousand, six hundred seventy-seven".