1625414211521 has 2 divisors, whose sum is σ = 1625414211522. Its totient is φ = 1625414211520.

The previous prime is 1625414211493. The next prime is 1625414211527. The reversal of 1625414211521 is 1251124145261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1622148660496 + 3265551025 = 1273636^2 + 57145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625414211521 - 2¹⁴ = 1625414195137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1625414211527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812707105760 + 812707105761.

It is an arithmetic number, because the mean of its divisors is an integer number (812707105761).

Almost surely, 2^{1625414211521} is an apocalyptic number.

It is an amenable number.

1625414211521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625414211521 is an equidigital number, since it uses as much as digits as its factorization.

1625414211521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 35.

Adding to 1625414211521 its reverse (1251124145261), we get a palindrome (2876538356782).

The spelling of 1625414211521 in words is "one trillion, six hundred twenty-five billion, four hundred fourteen million, two hundred eleven thousand, five hundred twenty-one".