127561620331 has 4 divisors (see below), whose sum is σ = 128095351200. Its totient is φ = 127027889464.

The previous prime is 127561620311. The next prime is 127561620343. The reversal of 127561620331 is 133026165721.

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 127561620331 - 2⁹ = 127561619819 is a prime.

It is a super-2 number, since 2×127561620331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127561620311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266865076 + ... + 266865553.

It is an arithmetic number, because the mean of its divisors is an integer number (32023837800).

Almost surely, 2^127561620331 is an apocalyptic number.

127561620331 is a deficient number, since it is larger than the sum of its proper divisors (533730869).

127561620331 is an equidigital number, since it uses as much as digits as its factorization.

127561620331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533730868.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 127561620331 in words is "one hundred twenty-seven billion, five hundred sixty-one million, six hundred twenty thousand, three hundred thirty-one".