766670137 has 2 divisors, whose sum is σ = 766670138. Its totient is φ = 766670136.

The previous prime is 766670089. The next prime is 766670147. The reversal of 766670137 is 731076667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509901561 + 256768576 = 22581^2 + 16024^2 .

It is an emirp because it is prime and its reverse (731076667) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 766670137 - 2²³ = 758281529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 766670093 and 766670102.

It is not a weakly prime, because it can be changed into another prime (766670147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383335068 + 383335069.

It is an arithmetic number, because the mean of its divisors is an integer number (383335069).

Almost surely, 2^766670137 is an apocalyptic number.

It is an amenable number.

766670137 is a deficient number, since it is larger than the sum of its proper divisors (1).

766670137 is an equidigital number, since it uses as much as digits as its factorization.

766670137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 43.

The square root of 766670137 is about 27688.8088765118. The cubic root of 766670137 is about 915.2425077099.

The spelling of 766670137 in words is "seven hundred sixty-six million, six hundred seventy thousand, one hundred thirty-seven".