140420400161 has 2 divisors, whose sum is σ = 140420400162. Its totient is φ = 140420400160.

The previous prime is 140420400077. The next prime is 140420400179. The reversal of 140420400161 is 161004024041.

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., 137970645136 + 2449755025 = 371444^2 + 49495^2 .

It is a cyclic number.

It is not a de Polignac number, because 140420400161 - 2¹⁴ = 140420383777 is a prime.

It is not a weakly prime, because it can be changed into another prime (140420409161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70210200080 + 70210200081.

It is an arithmetic number, because the mean of its divisors is an integer number (70210200081).

Almost surely, 2^140420400161 is an apocalyptic number.

It is an amenable number.

140420400161 is a deficient number, since it is larger than the sum of its proper divisors (1).

140420400161 is an equidigital number, since it uses as much as digits as its factorization.

140420400161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The spelling of 140420400161 in words is "one hundred forty billion, four hundred twenty million, four hundred thousand, one hundred sixty-one".