77061008641 has 4 divisors (see below), whose sum is σ = 77080615984. Its totient is φ = 77041401300.

The previous prime is 77061008617. The next prime is 77061008671. The reversal of 77061008641 is 14680016077.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14680016077 = 179 ⋅82011263.

It is a cyclic number.

It is not a de Polignac number, because 77061008641 - 2¹³ = 77061000449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77061008594 and 77061008603.

It is not an unprimeable number, because it can be changed into a prime (77061008671) 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, 9797775 + ... + 9805636.

It is an arithmetic number, because the mean of its divisors is an integer number (19270153996).

Almost surely, 2^77061008641 is an apocalyptic number.

It is an amenable number.

77061008641 is a deficient number, since it is larger than the sum of its proper divisors (19607343).

77061008641 is a wasteful number, since it uses less digits than its factorization.

77061008641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19607342.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 77061008641 in words is "seventy-seven billion, sixty-one million, eight thousand, six hundred forty-one".