77430787265 has 16 divisors (see below), whose sum is σ = 100642823568. Its totient is φ = 56849131776.

The previous prime is 77430787253. The next prime is 77430787271. The reversal of 77430787265 is 56278703477.

It can be written as a sum of positive squares in 8 ways, for example, as 5035889296 + 72394897969 = 70964^2 + 269063^2 .

It is a cyclic number.

It is not a de Polignac number, because 77430787265 - 2⁶ = 77430787201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77430787265.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3431654 + ... + 3454143.

It is an arithmetic number, because the mean of its divisors is an integer number (6290176473).

Almost surely, 2^77430787265 is an apocalyptic number.

It is an amenable number.

77430787265 is a deficient number, since it is larger than the sum of its proper divisors (23212036303).

77430787265 is a wasteful number, since it uses less digits than its factorization.

77430787265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6885988.

The product of its (nonzero) digits is 13829760, while the sum is 56.

The spelling of 77430787265 in words is "seventy-seven billion, four hundred thirty million, seven hundred eighty-seven thousand, two hundred sixty-five".