15418808673421 has 2 divisors, whose sum is σ = 15418808673422. Its totient is φ = 15418808673420.

The previous prime is 15418808673403. The next prime is 15418808673467. The reversal of 15418808673421 is 12437680881451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14893964932900 + 524843740521 = 3859270^2 + 724461^2 .

It is a cyclic number.

It is not a de Polignac number, because 15418808673421 - 2²³ = 15418800284813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15418808677421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7709404336710 + 7709404336711.

It is an arithmetic number, because the mean of its divisors is an integer number (7709404336711).

Almost surely, 2^{15418808673421} is an apocalyptic number.

It is an amenable number.

15418808673421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15418808673421 is an equidigital number, since it uses as much as digits as its factorization.

15418808673421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 15418808673421 in words is "fifteen trillion, four hundred eighteen billion, eight hundred eight million, six hundred seventy-three thousand, four hundred twenty-one".