1623419998225 has 9 divisors (see below), whose sum is σ = 2013048697467. Its totient is φ = 1298730902040.

The previous prime is 1623419998223. The next prime is 1623419998279. The reversal of 1623419998225 is 5228999143261.

The square root of 1623419998225 is 1274135.

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

It can be written as a sum of positive squares in only one way, i.e., 584431199361 + 1038988798864 = 764481^2 + 1019308^2 .

It is not a de Polignac number, because 1623419998225 - 2¹ = 1623419998223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623419998223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6243262 + ... + 6498088.

Almost surely, 2^{1623419998225} is an apocalyptic number.

1623419998225 is the 1274135-th square number.

1623419998225 is the 637068-th centered octagonal number.

It is an amenable number.

1623419998225 is a deficient number, since it is larger than the sum of its proper divisors (389628699242).

1623419998225 is an frugal number, since it uses more digits than its factorization.

1623419998225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509664 (or 254832 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 61.

The spelling of 1623419998225 in words is "one trillion, six hundred twenty-three billion, four hundred nineteen million, nine hundred ninety-eight thousand, two hundred twenty-five".