1872567958421 has 2 divisors, whose sum is σ = 1872567958422. Its totient is φ = 1872567958420.

The previous prime is 1872567958411. The next prime is 1872567958501. The reversal of 1872567958421 is 1248597652781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1817818510225 + 54749448196 = 1348265^2 + 233986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872567958421 - 2¹⁰ = 1872567957397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1872567958411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936283979210 + 936283979211.

It is an arithmetic number, because the mean of its divisors is an integer number (936283979211).

Almost surely, 2^{1872567958421} is an apocalyptic number.

It is an amenable number.

1872567958421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872567958421 is an equidigital number, since it uses as much as digits as its factorization.

1872567958421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67737600, while the sum is 65.

The spelling of 1872567958421 in words is "one trillion, eight hundred seventy-two billion, five hundred sixty-seven million, nine hundred fifty-eight thousand, four hundred twenty-one".