1153406421605 has 16 divisors (see below), whose sum is σ = 1467504033264. Its totient is φ = 867262356480.

The previous prime is 1153406421599. The next prime is 1153406421619. The reversal of 1153406421605 is 5061246043511.

It can be written as a sum of positive squares in 8 ways, for example, as 40197844036 + 1113208577569 = 200494^2 + 1055087^2 .

It is not a de Polignac number, because 1153406421605 - 2¹⁸ = 1153406159461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9193826 + ... + 9318435.

It is an arithmetic number, because the mean of its divisors is an integer number (91719002079).

Almost surely, 2^{1153406421605} is an apocalyptic number.

It is an amenable number.

1153406421605 is a deficient number, since it is larger than the sum of its proper divisors (314097611659).

1153406421605 is a wasteful number, since it uses less digits than its factorization.

1153406421605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18513016.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 1153406421605 in words is "one trillion, one hundred fifty-three billion, four hundred six million, four hundred twenty-one thousand, six hundred five".