77774720705 has 64 divisors (see below), whose sum is σ = 105219468288. Its totient is φ = 54701256960.

The previous prime is 77774720701. The next prime is 77774720711. The reversal of 77774720705 is 50702747777.

It is not a de Polignac number, because 77774720705 - 2² = 77774720701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77774720701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 148708574 + ... + 148709096.

It is an arithmetic number, because the mean of its divisors is an integer number (1644054192).

Almost surely, 2^77774720705 is an apocalyptic number.

It is an amenable number.

77774720705 is a deficient number, since it is larger than the sum of its proper divisors (27444747583).

77774720705 is a wasteful number, since it uses less digits than its factorization.

77774720705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 4705960, while the sum is 53.

The spelling of 77774720705 in words is "seventy-seven billion, seven hundred seventy-four million, seven hundred twenty thousand, seven hundred five".