19351420950625 has 15 divisors (see below), whose sum is σ = 24181673046223. Its totient is φ = 15481048780000.

The previous prime is 19351420950623. The next prime is 19351420950643. The reversal of 19351420950625 is 52605902415391.

The square root of 19351420950625 is 4399025.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 2651579086689 + 16699841863936 = 1628367^2 + 4086544^2 .

It is not a de Polignac number, because 19351420950625 - 2¹ = 19351420950623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19351420950623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 109887645 + ... + 110063605.

Almost surely, 2^{19351420950625} is an apocalyptic number.

19351420950625 is the 4399025-th square number.

19351420950625 is the 2199513-rd centered octagonal number.

It is an amenable number.

19351420950625 is a deficient number, since it is larger than the sum of its proper divisors (4830252095598).

19351420950625 is an frugal number, since it uses more digits than its factorization.

19351420950625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351942 (or 175966 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 52.

The spelling of 19351420950625 in words is "nineteen trillion, three hundred fifty-one billion, four hundred twenty million, nine hundred fifty thousand, six hundred twenty-five".