1616720487493 has 2 divisors, whose sum is σ = 1616720487494. Its totient is φ = 1616720487492.

The previous prime is 1616720487467. The next prime is 1616720487497. The reversal of 1616720487493 is 3947840276161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1480838308609 + 135882178884 = 1216897^2 + 368622^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616720487493 - 2⁹ = 1616720486981 is a prime.

It is a super-2 number, since 2×1616720487493² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1616720487497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 808360243746 + 808360243747.

It is an arithmetic number, because the mean of its divisors is an integer number (808360243747).

Almost surely, 2^{1616720487493} is an apocalyptic number.

It is an amenable number.

1616720487493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1616720487493 is an equidigital number, since it uses as much as digits as its factorization.

1616720487493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 1616720487493 in words is "one trillion, six hundred sixteen billion, seven hundred twenty million, four hundred eighty-seven thousand, four hundred ninety-three".