77770522261 has 4 divisors (see below), whose sum is σ = 79425214272. Its totient is φ = 76115830252.

The previous prime is 77770522253. The next prime is 77770522301. The reversal of 77770522261 is 16222507777.

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.

It is a cyclic number.

It is not a de Polignac number, because 77770522261 - 2³ = 77770522253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77770022261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827345935 + ... + 827346028.

It is an arithmetic number, because the mean of its divisors is an integer number (19856303568).

Almost surely, 2^77770522261 is an apocalyptic number.

It is an amenable number.

77770522261 is a deficient number, since it is larger than the sum of its proper divisors (1654692011).

77770522261 is a wasteful number, since it uses less digits than its factorization.

77770522261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1654692010.

The product of its (nonzero) digits is 576240, while the sum is 46.

The spelling of 77770522261 in words is "seventy-seven billion, seven hundred seventy million, five hundred twenty-two thousand, two hundred sixty-one".