164614678381 has 2 divisors, whose sum is σ = 164614678382. Its totient is φ = 164614678380.

The previous prime is 164614678231. The next prime is 164614678429. The reversal of 164614678381 is 183876416461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160861155625 + 3753522756 = 401075^2 + 61266^2 .

It is a cyclic number.

It is not a de Polignac number, because 164614678381 - 2¹⁷ = 164614547309 is a prime.

It is a super-2 number, since 2×164614678381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164614678181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82307339190 + 82307339191.

It is an arithmetic number, because the mean of its divisors is an integer number (82307339191).

Almost surely, 2^164614678381 is an apocalyptic number.

It is an amenable number.

164614678381 is a deficient number, since it is larger than the sum of its proper divisors (1).

164614678381 is an equidigital number, since it uses as much as digits as its factorization.

164614678381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 55.

The spelling of 164614678381 in words is "one hundred sixty-four billion, six hundred fourteen million, six hundred seventy-eight thousand, three hundred eighty-one".