1216620030025 has 27 divisors (see below), whose sum is σ = 1535022405831. Its totient is φ = 956543584080.

The previous prime is 1216620030019. The next prime is 1216620030137. The reversal of 1216620030025 is 5200300266121.

The square root of 1216620030025 is 1103005.

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., 437983210809 + 778636819216 = 661803^2 + 882404^2 .

It is not a de Polignac number, because 1216620030025 - 2¹³ = 1216620021833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216620029975 and 1216620030002.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 325384606 + ... + 325388344.

Almost surely, 2^{1216620030025} is an apocalyptic number.

1216620030025 is the 1103005-th square number.

1216620030025 is the 551503-rd centered octagonal number.

It is an amenable number.

1216620030025 is a deficient number, since it is larger than the sum of its proper divisors (318402375806).

1216620030025 is an frugal number, since it uses more digits than its factorization.

1216620030025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7606 (or 3803 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 1216620030025 its reverse (5200300266121), we get a palindrome (6416920296146).

The spelling of 1216620030025 in words is "one trillion, two hundred sixteen billion, six hundred twenty million, thirty thousand, twenty-five".