1604515147421 has 2 divisors, whose sum is σ = 1604515147422. Its totient is φ = 1604515147420.

The previous prime is 1604515147357. The next prime is 1604515147423. The reversal of 1604515147421 is 1247415154061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113795283225 + 490719864196 = 1055365^2 + 700514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604515147421 - 2⁶ = 1604515147357 is a prime.

Together with 1604515147423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1604515147423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802257573710 + 802257573711.

It is an arithmetic number, because the mean of its divisors is an integer number (802257573711).

Almost surely, 2^{1604515147421} is an apocalyptic number.

It is an amenable number.

1604515147421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604515147421 is an equidigital number, since it uses as much as digits as its factorization.

1604515147421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 1604515147421 in words is "one trillion, six hundred four billion, five hundred fifteen million, one hundred forty-seven thousand, four hundred twenty-one".