126817981537 has 8 divisors (see below), whose sum is σ = 137391016896. Its totient is φ = 116361775632.

The previous prime is 126817981519. The next prime is 126817981613. The reversal of 126817981537 is 735189718621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126817981537 - 2²³ = 126809592929 is a prime.

It is a super-2 number, since 2×126817981537² (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 (126817981937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29205103 + ... + 29209444.

It is an arithmetic number, because the mean of its divisors is an integer number (17173877112).

Almost surely, 2^126817981537 is an apocalyptic number.

It is an amenable number.

126817981537 is a deficient number, since it is larger than the sum of its proper divisors (10573035359).

126817981537 is a wasteful number, since it uses less digits than its factorization.

126817981537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58414727.

The product of its digits is 5080320, while the sum is 58.

The spelling of 126817981537 in words is "one hundred twenty-six billion, eight hundred seventeen million, nine hundred eighty-one thousand, five hundred thirty-seven".