77772061265 has 12 divisors (see below), whose sum is σ = 94386915804. Its totient is φ = 61518542976.

The previous prime is 77772061259. The next prime is 77772061271. The reversal of 77772061265 is 56216027777.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77772061259) and next prime (77772061271).

It can be written as a sum of positive squares in 6 ways, for example, as 37509230929 + 40262830336 = 193673^2 + 200656^2 .

It is not a de Polignac number, because 77772061265 - 2⁴ = 77772061249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 942242 + ... + 1021451.

It is an arithmetic number, because the mean of its divisors is an integer number (7865576317).

Almost surely, 2^77772061265 is an apocalyptic number.

It is an amenable number.

77772061265 is a deficient number, since it is larger than the sum of its proper divisors (16614854539).

77772061265 is an equidigital number, since it uses as much as digits as its factorization.

77772061265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963876 (or 1963787 counting only the distinct ones).

The product of its (nonzero) digits is 1728720, while the sum is 50.

The spelling of 77772061265 in words is "seventy-seven billion, seven hundred seventy-two million, sixty-one thousand, two hundred sixty-five".