51670381667 has 2 divisors, whose sum is σ = 51670381668. Its totient is φ = 51670381666.

The previous prime is 51670381643. The next prime is 51670381747. The reversal of 51670381667 is 76618307615.

51670381667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51670381667 is a prime.

It is a super-2 number, since 2×51670381667² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51670381967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25835190833 + 25835190834.

It is an arithmetic number, because the mean of its divisors is an integer number (25835190834).

Almost surely, 2^51670381667 is an apocalyptic number.

51670381667 is a deficient number, since it is larger than the sum of its proper divisors (1).

51670381667 is an equidigital number, since it uses as much as digits as its factorization.

51670381667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 51670381667 in words is "fifty-one billion, six hundred seventy million, three hundred eighty-one thousand, six hundred sixty-seven".