77681320562463 has 4 divisors (see below), whose sum is σ = 103575094083288. Its totient is φ = 51787547041640.

The previous prime is 77681320562449. The next prime is 77681320562477. The reversal of 77681320562463 is 36426502318677.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (77681320562449) and next prime (77681320562477).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77681320562463 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77681320562397 and 77681320562406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77681322562463) 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, 12946886760408 + ... + 12946886760413.

It is an arithmetic number, because the mean of its divisors is an integer number (25893773520822).

Almost surely, 2^{77681320562463} is an apocalyptic number.

77681320562463 is a deficient number, since it is larger than the sum of its proper divisors (25893773520825).

77681320562463 is a wasteful number, since it uses less digits than its factorization.

77681320562463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25893773520824.

The product of its (nonzero) digits is 60963840, while the sum is 60.

The spelling of 77681320562463 in words is "seventy-seven trillion, six hundred eighty-one billion, three hundred twenty million, five hundred sixty-two thousand, four hundred sixty-three".