16121640663451 has 2 divisors, whose sum is σ = 16121640663452. Its totient is φ = 16121640663450.

The previous prime is 16121640663433. The next prime is 16121640663467. The reversal of 16121640663451 is 15436604612161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16121640663451 - 2²³ = 16121632274843 is a prime.

It is not a weakly prime, because it can be changed into another prime (16121649663451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8060820331725 + 8060820331726.

It is an arithmetic number, because the mean of its divisors is an integer number (8060820331726).

Almost surely, 2^{16121640663451} is an apocalyptic number.

16121640663451 is a deficient number, since it is larger than the sum of its proper divisors (1).

16121640663451 is an equidigital number, since it uses as much as digits as its factorization.

16121640663451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 16121640663451 in words is "sixteen trillion, one hundred twenty-one billion, six hundred forty million, six hundred sixty-three thousand, four hundred fifty-one".