15405140423989 has 2 divisors, whose sum is σ = 15405140423990. Its totient is φ = 15405140423988.

The previous prime is 15405140423983. The next prime is 15405140424061. The reversal of 15405140423989 is 98932404150451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15074256623364 + 330883800625 = 3882558^2 + 575225^2 .

It is a cyclic number.

It is not a de Polignac number, because 15405140423989 - 2⁷ = 15405140423861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15405140423983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7702570211994 + 7702570211995.

It is an arithmetic number, because the mean of its divisors is an integer number (7702570211995).

Almost surely, 2^{15405140423989} is an apocalyptic number.

It is an amenable number.

15405140423989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15405140423989 is an equidigital number, since it uses as much as digits as its factorization.

15405140423989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 15405140423989 in words is "fifteen trillion, four hundred five billion, one hundred forty million, four hundred twenty-three thousand, nine hundred eighty-nine".