127785265581218 has 12 divisors (see below), whose sum is σ = 222972249126582. Its totient is φ = 54765113820480.

The previous prime is 127785265581217. The next prime is 127785265581283. The reversal of 127785265581218 is 812185562587721.

It can be written as a sum of positive squares in only one way, i.e., 127632308717809 + 152956863409 = 11297447^2 + 391097^2 .

It is not an unprimeable number, because it can be changed into a prime (127785265581217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 651965640623 + ... + 651965640818.

Almost surely, 2^{127785265581218} is an apocalyptic number.

127785265581218 is a deficient number, since it is larger than the sum of its proper divisors (95186983545364).

127785265581218 is a wasteful number, since it uses less digits than its factorization.

127785265581218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303931281457 (or 1303931281450 counting only the distinct ones).

The product of its digits is 150528000, while the sum is 68.

The spelling of 127785265581218 in words is "one hundred twenty-seven trillion, seven hundred eighty-five billion, two hundred sixty-five million, five hundred eighty-one thousand, two hundred eighteen".