77763880747225 has 12 divisors (see below), whose sum is σ = 98779095350460. Its totient is φ = 60693760582400.

The previous prime is 77763880747199. The next prime is 77763880747243. The reversal of 77763880747225 is 52274708836777.

It can be written as a sum of positive squares in 6 ways, for example, as 13572762279129 + 64191118468096 = 3684123^2 + 8011936^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77763880747225 is a prime.

It is a super-2 number, since 2×77763880747225² (a number of 29 digits) contains 22 as substring.

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, 37933599340 + ... + 37933601389.

It is an arithmetic number, because the mean of its divisors is an integer number (8231591279205).

Almost surely, 2^{77763880747225} is an apocalyptic number.

It is an amenable number.

77763880747225 is a deficient number, since it is larger than the sum of its proper divisors (21015214603235).

77763880747225 is a wasteful number, since it uses less digits than its factorization.

77763880747225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75867200780 (or 75867200775 counting only the distinct ones).

The product of its (nonzero) digits is 1548933120, while the sum is 73.

The spelling of 77763880747225 in words is "seventy-seven trillion, seven hundred sixty-three billion, eight hundred eighty million, seven hundred forty-seven thousand, two hundred twenty-five".