18916958505769 has 9 divisors (see below), whose sum is σ = 19106553234999. Its totient is φ = 18729226950600.

The previous prime is 18916958505691. The next prime is 18916958505847. The reversal of 18916958505769 is 96750585961981.

The square root of 18916958505769 is 4349363.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (18916958505691) and next prime (18916958505847).

It can be written as a sum of positive squares in only one way, i.e., 18175189718169 + 741768787600 = 4263237^2 + 861260^2 .

It is not a de Polignac number, because 18916958505769 - 2⁹ = 18916958505257 is a prime.

It is a super-2 number, since 2×18916958505769² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18916958545769) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 439264132 + ... + 439307194.

Almost surely, 2^{18916958505769} is an apocalyptic number.

18916958505769 is the 4349363-rd square number.

18916958505769 is the 2174682-nd centered octagonal number.

It is an amenable number.

18916958505769 is a deficient number, since it is larger than the sum of its proper divisors (189594729230).

18916958505769 is an frugal number, since it uses more digits than its factorization.

18916958505769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86328 (or 43164 counting only the distinct ones).

The product of its (nonzero) digits is 1469664000, while the sum is 79.

The spelling of 18916958505769 in words is "eighteen trillion, nine hundred sixteen billion, nine hundred fifty-eight million, five hundred five thousand, seven hundred sixty-nine".