126640671242 has 16 divisors (see below), whose sum is σ = 197812800000. Its totient is φ = 60731991600.

The previous prime is 126640671229. The next prime is 126640671247. The reversal of 126640671242 is 242176046621.

It is a happy number.

It is a super-2 number, since 2×126640671242² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126640671242.

It is not an unprimeable number, because it can be changed into a prime (126640671247) 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, 7221242 + ... + 7238757.

It is an arithmetic number, because the mean of its divisors is an integer number (12363300000).

Almost surely, 2^126640671242 is an apocalyptic number.

126640671242 is a deficient number, since it is larger than the sum of its proper divisors (71172128758).

126640671242 is a wasteful number, since it uses less digits than its factorization.

126640671242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14460181.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 126640671242 in words is "one hundred twenty-six billion, six hundred forty million, six hundred seventy-one thousand, two hundred forty-two".