18511779364 has 27 divisors (see below), whose sum is σ = 35085978963. Its totient is φ = 8542265472.

The previous prime is 18511779361. The next prime is 18511779367. The reversal of 18511779364 is 46397711581.

The square root of 18511779364 is 136058.

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 (18511779361) and next prime (18511779367).

It can be written as a sum of positive squares in 4 ways, for example, as 737556964 + 17774222400 = 27158^2 + 133320^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18511779361) 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, 3534892 + ... + 3540124.

Almost surely, 2^18511779364 is an apocalyptic number.

18511779364 is the 136058-th square number.

It is an amenable number.

18511779364 is a deficient number, since it is larger than the sum of its proper divisors (16574199599).

18511779364 is an frugal number, since it uses more digits than its factorization.

18511779364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10496 (or 5248 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 52.

The spelling of 18511779364 in words is "eighteen billion, five hundred eleven million, seven hundred seventy-nine thousand, three hundred sixty-four".