127645400777231 has 4 divisors (see below), whose sum is σ = 127646969967000. Its totient is φ = 127643831587464.

The previous prime is 127645400777207. The next prime is 127645400777311. The reversal of 127645400777231 is 132777004546721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 127645400777231 - 2³⁸ = 127370522870287 is a prime.

It is a super-2 number, since 2×127645400777231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127645400777731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784472861 + ... + 784635558.

It is an arithmetic number, because the mean of its divisors is an integer number (31911742491750).

Almost surely, 2^{127645400777231} is an apocalyptic number.

127645400777231 is a deficient number, since it is larger than the sum of its proper divisors (1569189769).

127645400777231 is an equidigital number, since it uses as much as digits as its factorization.

127645400777231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569189768.

The product of its (nonzero) digits is 13829760, while the sum is 56.

The spelling of 127645400777231 in words is "one hundred twenty-seven trillion, six hundred forty-five billion, four hundred million, seven hundred seventy-seven thousand, two hundred thirty-one".