127438631661 has 16 divisors (see below), whose sum is σ = 186160852800. Its totient is φ = 76904046720.

The previous prime is 127438631641. The next prime is 127438631689. The reversal of 127438631661 is 166136834721.

It is a happy number.

It is not a de Polignac number, because 127438631661 - 2⁵ = 127438631629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127438631661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127438631641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8279386 + ... + 8294763.

It is an arithmetic number, because the mean of its divisors is an integer number (11635053300).

Almost surely, 2^127438631661 is an apocalyptic number.

127438631661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

127438631661 is a deficient number, since it is larger than the sum of its proper divisors (58722221139).

127438631661 is a wasteful number, since it uses less digits than its factorization.

127438631661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16574396.

The product of its digits is 870912, while the sum is 48.

The spelling of 127438631661 in words is "one hundred twenty-seven billion, four hundred thirty-eight million, six hundred thirty-one thousand, six hundred sixty-one".