126807800261 has 4 divisors (see below), whose sum is σ = 126809069772. Its totient is φ = 126806530752.

The previous prime is 126807800221. The next prime is 126807800263. The reversal of 126807800261 is 162008708621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162008708621 = 127 ⋅1275659123.

It can be written as a sum of positive squares in 2 ways, for example, as 23011069636 + 103796730625 = 151694^2 + 322175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126807800261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126807800263) 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, 470810 + ... + 689403.

It is an arithmetic number, because the mean of its divisors is an integer number (31702267443).

Almost surely, 2^126807800261 is an apocalyptic number.

It is an amenable number.

126807800261 is a deficient number, since it is larger than the sum of its proper divisors (1269511).

126807800261 is a wasteful number, since it uses less digits than its factorization.

126807800261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269510.

The product of its (nonzero) digits is 64512, while the sum is 41.

The spelling of 126807800261 in words is "one hundred twenty-six billion, eight hundred seven million, eight hundred thousand, two hundred sixty-one".