1621725025267 has 2 divisors, whose sum is σ = 1621725025268. Its totient is φ = 1621725025266.

The previous prime is 1621725025231. The next prime is 1621725025321. The reversal of 1621725025267 is 7625205271261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1621725025267 - 2¹⁵ = 1621724992499 is a prime.

It is not a weakly prime, because it can be changed into another prime (1621725025567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810862512633 + 810862512634.

It is an arithmetic number, because the mean of its divisors is an integer number (810862512634).

Almost surely, 2^{1621725025267} is an apocalyptic number.

1621725025267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621725025267 is an equidigital number, since it uses as much as digits as its factorization.

1621725025267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 705600, while the sum is 46.

The spelling of 1621725025267 in words is "one trillion, six hundred twenty-one billion, seven hundred twenty-five million, twenty-five thousand, two hundred sixty-seven".