77715635441 has 2 divisors, whose sum is σ = 77715635442. Its totient is φ = 77715635440.

The previous prime is 77715635401. The next prime is 77715635453. The reversal of 77715635441 is 14453651777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77450890000 + 264745441 = 278300^2 + 16271^2 .

It is an emirp because it is prime and its reverse (14453651777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77715635441 - 2¹⁰ = 77715634417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77715635441.

It is not a weakly prime, because it can be changed into another prime (77715635401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38857817720 + 38857817721.

It is an arithmetic number, because the mean of its divisors is an integer number (38857817721).

Almost surely, 2^77715635441 is an apocalyptic number.

It is an amenable number.

77715635441 is a deficient number, since it is larger than the sum of its proper divisors (1).

77715635441 is an equidigital number, since it uses as much as digits as its factorization.

77715635441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2469600, while the sum is 50.

The spelling of 77715635441 in words is "seventy-seven billion, seven hundred fifteen million, six hundred thirty-five thousand, four hundred forty-one".