127777605025566 has 16 divisors (see below), whose sum is σ = 257943576501504. Its totient is φ = 42194473933464.

The previous prime is 127777605025523. The next prime is 127777605025601. The reversal of 127777605025566 is 665520506777721.

It is a junction number, because it is equal to n+sod(n) for n = 127777605025497 and 127777605025506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99515268070 + ... + 99515269353.

It is an arithmetic number, because the mean of its divisors is an integer number (16121473531344).

Almost surely, 2^{127777605025566} is an apocalyptic number.

127777605025566 is an abundant number, since it is smaller than the sum of its proper divisors (130165971475938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

127777605025566 is a wasteful number, since it uses less digits than its factorization.

127777605025566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199030537535.

The product of its (nonzero) digits is 259308000, while the sum is 66.

The spelling of 127777605025566 in words is "one hundred twenty-seven trillion, seven hundred seventy-seven billion, six hundred five million, twenty-five thousand, five hundred sixty-six".