12956128537 has 16 divisors (see below), whose sum is σ = 14653082880. Its totient is φ = 11347459200.

The previous prime is 12956128483. The next prime is 12956128543. The reversal of 12956128537 is 73582165921.

It is not a de Polignac number, because 12956128537 - 2¹⁵ = 12956095769 is a prime.

It is a super-2 number, since 2×12956128537² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12956128037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103837 + ... + 191557.

It is an arithmetic number, because the mean of its divisors is an integer number (915817680).

Almost surely, 2^12956128537 is an apocalyptic number.

It is an amenable number.

12956128537 is a deficient number, since it is larger than the sum of its proper divisors (1696954343).

12956128537 is a wasteful number, since it uses less digits than its factorization.

12956128537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88224.

The product of its digits is 907200, while the sum is 49.

The spelling of 12956128537 in words is "twelve billion, nine hundred fifty-six million, one hundred twenty-eight thousand, five hundred thirty-seven".