146663961581 has 2 divisors, whose sum is σ = 146663961582. Its totient is φ = 146663961580.

The previous prime is 146663961557. The next prime is 146663961583. The reversal of 146663961581 is 185169366641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146562637225 + 101324356 = 382835^2 + 10066^2 .

It is a cyclic number.

It is not a de Polignac number, because 146663961581 - 2²² = 146659767277 is a prime.

It is a super-2 number, since 2×146663961581² (a number of 23 digits) contains 22 as substring.

Together with 146663961583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146663961583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73331980790 + 73331980791.

It is an arithmetic number, because the mean of its divisors is an integer number (73331980791).

Almost surely, 2^146663961581 is an apocalyptic number.

It is an amenable number.

146663961581 is a deficient number, since it is larger than the sum of its proper divisors (1).

146663961581 is an equidigital number, since it uses as much as digits as its factorization.

146663961581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 56.

The spelling of 146663961581 in words is "one hundred forty-six billion, six hundred sixty-three million, nine hundred sixty-one thousand, five hundred eighty-one".