77367538645 has 8 divisors (see below), whose sum is σ = 98302284504. Its totient is φ = 58253205504.

The previous prime is 77367538607. The next prime is 77367538649. The reversal of 77367538645 is 54683576377.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15110801476 + 62256737169 = 122926^2 + 249513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77367538645 - 2⁷ = 77367538517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77367538649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455103084 + ... + 455103253.

It is an arithmetic number, because the mean of its divisors is an integer number (12287785563).

Almost surely, 2^77367538645 is an apocalyptic number.

It is an amenable number.

77367538645 is a deficient number, since it is larger than the sum of its proper divisors (20934745859).

77367538645 is a wasteful number, since it uses less digits than its factorization.

77367538645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910206359.

The product of its digits is 88905600, while the sum is 61.

The spelling of 77367538645 in words is "seventy-seven billion, three hundred sixty-seven million, five hundred thirty-eight thousand, six hundred forty-five".