127256151517 has 4 divisors (see below), whose sum is σ = 138824892576. Its totient is φ = 115687410460.

The previous prime is 127256151499. The next prime is 127256151523. The reversal of 127256151517 is 715151652721.

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: 715151652721 = 11 ⋅65013786611.

It is a cyclic number.

It is not a de Polignac number, because 127256151517 - 2⁷ = 127256151389 is a prime.

It is a super-2 number, since 2×127256151517² (a number of 23 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 (127256155517) 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, 5784370513 + ... + 5784370534.

It is an arithmetic number, because the mean of its divisors is an integer number (34706223144).

Almost surely, 2^127256151517 is an apocalyptic number.

It is an amenable number.

127256151517 is a deficient number, since it is larger than the sum of its proper divisors (11568741059).

127256151517 is a wasteful number, since it uses less digits than its factorization.

127256151517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11568741058.

The product of its digits is 147000, while the sum is 43.

The spelling of 127256151517 in words is "one hundred twenty-seven billion, two hundred fifty-six million, one hundred fifty-one thousand, five hundred seventeen".