127920857469 has 4 divisors (see below), whose sum is σ = 170561143296. Its totient is φ = 85280571644.

The previous prime is 127920857447. The next prime is 127920857473. The reversal of 127920857469 is 964758029721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 964758029721 = 3 ⋅321586009907.

It is a cyclic number.

It is not a de Polignac number, because 127920857469 - 2⁷ = 127920857341 is a prime.

It is a super-2 number, since 2×127920857469² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127920857429) 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, 21320142909 + ... + 21320142914.

It is an arithmetic number, because the mean of its divisors is an integer number (42640285824).

Almost surely, 2^127920857469 is an apocalyptic number.

It is an amenable number.

127920857469 is a deficient number, since it is larger than the sum of its proper divisors (42640285827).

127920857469 is an equidigital number, since it uses as much as digits as its factorization.

127920857469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42640285826.

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 127920857469 in words is "one hundred twenty-seven billion, nine hundred twenty million, eight hundred fifty-seven thousand, four hundred sixty-nine".