1243064426405 has 16 divisors (see below), whose sum is σ = 1570343457600. Its totient is φ = 942017898240.

The previous prime is 1243064426321. The next prime is 1243064426473. The reversal of 1243064426405 is 5046244603421.

It is not a de Polignac number, because 1243064426405 - 2²² = 1243060232101 is a prime.

It is a super-2 number, since 2×1243064426405² (a number of 25 digits) contains 22 as substring.

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, 310301 + ... + 1606989.

It is an arithmetic number, because the mean of its divisors is an integer number (98146466100).

Almost surely, 2^{1243064426405} is an apocalyptic number.

It is an amenable number.

1243064426405 is a deficient number, since it is larger than the sum of its proper divisors (327279031195).

1243064426405 is a wasteful number, since it uses less digits than its factorization.

1243064426405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306804.

The product of its (nonzero) digits is 552960, while the sum is 41.

The spelling of 1243064426405 in words is "one trillion, two hundred forty-three billion, sixty-four million, four hundred twenty-six thousand, four hundred five".