1620775005425 has 6 divisors (see below), whose sum is σ = 2009761006758. Its totient is φ = 1296620004320.

The previous prime is 1620775005403. The next prime is 1620775005457. The reversal of 1620775005425 is 5245005770261.

It can be written as a sum of positive squares in 3 ways, for example, as 162112527424 + 1458662478001 = 402632^2 + 1207751^2 .

It is not a de Polignac number, because 1620775005425 - 2⁸ = 1620775005169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32415500084 + ... + 32415500133.

It is an arithmetic number, because the mean of its divisors is an integer number (334960167793).

Almost surely, 2^{1620775005425} is an apocalyptic number.

It is an amenable number.

1620775005425 is a deficient number, since it is larger than the sum of its proper divisors (388986001333).

1620775005425 is an equidigital number, since it uses as much as digits as its factorization.

1620775005425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64831000227 (or 64831000222 counting only the distinct ones).

The product of its (nonzero) digits is 588000, while the sum is 44.

The spelling of 1620775005425 in words is "one trillion, six hundred twenty billion, seven hundred seventy-five million, five thousand, four hundred twenty-five".