127260801561 has 4 divisors (see below), whose sum is σ = 169681068752. Its totient is φ = 84840534372.

The previous prime is 127260801559. The next prime is 127260801581. The reversal of 127260801561 is 165108062721.

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.

It is not a de Polignac number, because 127260801561 - 2¹ = 127260801559 is a prime.

It is a super-2 number, since 2×127260801561² (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 (127260801581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21210133591 + ... + 21210133596.

It is an arithmetic number, because the mean of its divisors is an integer number (42420267188).

Almost surely, 2^127260801561 is an apocalyptic number.

It is an amenable number.

127260801561 is a deficient number, since it is larger than the sum of its proper divisors (42420267191).

127260801561 is an equidigital number, since it uses as much as digits as its factorization.

127260801561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42420267190.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 127260801561 in words is "one hundred twenty-seven billion, two hundred sixty million, eight hundred one thousand, five hundred sixty-one".