127983631505 has 4 divisors (see below), whose sum is σ = 153580357812. Its totient is φ = 102386905200.

The previous prime is 127983631499. The next prime is 127983631511. The reversal of 127983631505 is 505136389721.

It is a Cunningham number, because it is equal to 357748²+1.

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

It is an interprime number because it is at equal distance from previous prime (127983631499) and next prime (127983631511).

It can be written as a sum of positive squares in 2 ways, for example, as 46073763904 + 81909867601 = 214648^2 + 286199^2 .

It is not a de Polignac number, because 127983631505 - 2²⁰ = 127982582929 is a prime.

It is a super-3 number, since 3×127983631505³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12798363146 + ... + 12798363155.

It is an arithmetic number, because the mean of its divisors is an integer number (38395089453).

Almost surely, 2^127983631505 is an apocalyptic number.

It is an amenable number.

127983631505 is a deficient number, since it is larger than the sum of its proper divisors (25596726307).

127983631505 is an equidigital number, since it uses as much as digits as its factorization.

127983631505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25596726306.

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 127983631505 in words is "one hundred twenty-seven billion, nine hundred eighty-three million, six hundred thirty-one thousand, five hundred five".