77626065361 has 4 divisors (see below), whose sum is σ = 83597301172. Its totient is φ = 71654829552.

The previous prime is 77626065359. The next prime is 77626065371. The reversal of 77626065361 is 16356062677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16356062677 = 22963 ⋅712279.

It can be written as a sum of positive squares in 2 ways, for example, as 14745487761 + 62880577600 = 121431^2 + 250760^2 .

It is a cyclic number.

It is not a de Polignac number, because 77626065361 - 2¹ = 77626065359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77626065371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2985617886 + ... + 2985617911.

It is an arithmetic number, because the mean of its divisors is an integer number (20899325293).

Almost surely, 2^77626065361 is an apocalyptic number.

It is an amenable number.

77626065361 is a deficient number, since it is larger than the sum of its proper divisors (5971235811).

77626065361 is a wasteful number, since it uses less digits than its factorization.

77626065361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5971235810.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The spelling of 77626065361 in words is "seventy-seven billion, six hundred twenty-six million, sixty-five thousand, three hundred sixty-one".