1246556556421 has 8 divisors (see below), whose sum is σ = 1371118557888. Its totient is φ = 1133233231900.

The previous prime is 1246556556419. The next prime is 1246556556433.

1246556556421 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1246556556421 - 2¹ = 1246556556419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1246556556461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468276865 + ... + 468279526.

It is an arithmetic number, because the mean of its divisors is an integer number (171389819736).

Almost surely, 2^{1246556556421} is an apocalyptic number.

1246556556421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1246556556421 is a deficient number, since it is larger than the sum of its proper divisors (124562001467).

1246556556421 is an frugal number, since it uses more digits than its factorization.

1246556556421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936556424 (or 936556402 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 52.

The spelling of 1246556556421 in words is "one trillion, two hundred forty-six billion, five hundred fifty-six million, five hundred fifty-six thousand, four hundred twenty-one".