16487786989 has 2 divisors, whose sum is σ = 16487786990. Its totient is φ = 16487786988.

The previous prime is 16487786983. The next prime is 16487787053. The reversal of 16487786989 is 98968778461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9171892900 + 7315894089 = 95770^2 + 85533^2 .

It is a cyclic number.

It is not a de Polignac number, because 16487786989 - 2³ = 16487786981 is a prime.

It is a super-2 number, since 2×16487786989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16487786981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8243893494 + 8243893495.

It is an arithmetic number, because the mean of its divisors is an integer number (8243893495).

Almost surely, 2^16487786989 is an apocalyptic number.

It is an amenable number.

16487786989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16487786989 is an equidigital number, since it uses as much as digits as its factorization.

16487786989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 292626432, while the sum is 73.

The spelling of 16487786989 in words is "sixteen billion, four hundred eighty-seven million, seven hundred eighty-six thousand, nine hundred eighty-nine".