1261375126107 has 16 divisors (see below), whose sum is σ = 1737220346880. Its totient is φ = 813258770400.

The previous prime is 1261375126079. The next prime is 1261375126129. The reversal of 1261375126107 is 7016215731621.

It is not a de Polignac number, because 1261375126107 - 2⁷ = 1261375125979 is a prime.

It is a super-2 number, since 2×1261375126107² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261375121107) 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, 4287132 + ... + 4571897.

It is an arithmetic number, because the mean of its divisors is an integer number (108576271680).

Almost surely, 2^{1261375126107} is an apocalyptic number.

1261375126107 is a deficient number, since it is larger than the sum of its proper divisors (475845220773).

1261375126107 is a wasteful number, since it uses less digits than its factorization.

1261375126107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8860594.

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 1261375126107 in words is "one trillion, two hundred sixty-one billion, three hundred seventy-five million, one hundred twenty-six thousand, one hundred seven".