266400139 has 2 divisors, whose sum is σ = 266400140. Its totient is φ = 266400138.

The previous prime is 266400137. The next prime is 266400157. The reversal of 266400139 is 931004662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266400139 - 2¹ = 266400137 is a prime.

Together with 266400137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 266400139.

It is not a weakly prime, because it can be changed into another prime (266400131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133200069 + 133200070.

It is an arithmetic number, because the mean of its divisors is an integer number (133200070).

Almost surely, 2^266400139 is an apocalyptic number.

266400139 is a deficient number, since it is larger than the sum of its proper divisors (1).

266400139 is an equidigital number, since it uses as much as digits as its factorization.

266400139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 266400139 is about 16321.7688686000. The cubic root of 266400139 is about 643.4450768935.

The spelling of 266400139 in words is "two hundred sixty-six million, four hundred thousand, one hundred thirty-nine".