146390879681 has 2 divisors, whose sum is σ = 146390879682. Its totient is φ = 146390879680.

The previous prime is 146390879669. The next prime is 146390879729. The reversal of 146390879681 is 186978093641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135307001281 + 11083878400 = 367841^2 + 105280^2 .

It is a cyclic number.

It is not a de Polignac number, because 146390879681 - 2³⁴ = 129211010497 is a prime.

It is a super-2 number, since 2×146390879681² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (146390879381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73195439840 + 73195439841.

It is an arithmetic number, because the mean of its divisors is an integer number (73195439841).

Almost surely, 2^146390879681 is an apocalyptic number.

It is an amenable number.

146390879681 is a deficient number, since it is larger than the sum of its proper divisors (1).

146390879681 is an equidigital number, since it uses as much as digits as its factorization.

146390879681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 146390879681 in words is "one hundred forty-six billion, three hundred ninety million, eight hundred seventy-nine thousand, six hundred eighty-one".