1621787367287 has 2 divisors, whose sum is σ = 1621787367288. Its totient is φ = 1621787367286.

The previous prime is 1621787367271. The next prime is 1621787367329. The reversal of 1621787367287 is 7827637871261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1621787367287 - 2⁴ = 1621787367271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621787367227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810893683643 + 810893683644.

It is an arithmetic number, because the mean of its divisors is an integer number (810893683644).

Almost surely, 2^{1621787367287} is an apocalyptic number.

1621787367287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621787367287 is an equidigital number, since it uses as much as digits as its factorization.

1621787367287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66382848, while the sum is 65.

The spelling of 1621787367287 in words is "one trillion, six hundred twenty-one billion, seven hundred eighty-seven million, three hundred sixty-seven thousand, two hundred eighty-seven".