18339659776 has 85 divisors (see below), whose sum is σ = 38346262831. Its totient is φ = 8771141632.

The previous prime is 18339659773. The next prime is 18339659791. The reversal of 18339659776 is 67795693381.

It is a happy number.

The square root of 18339659776 is 135424.

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

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18339659773) by changing a digit.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 797376501 + ... + 797376523.

Almost surely, 2^18339659776 is an apocalyptic number.

18339659776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18339659776 is the 135424-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18339659776

18339659776 is an abundant number, since it is smaller than the sum of its proper divisors (20006603055).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18339659776 is an frugal number, since it uses more digits than its factorization.

18339659776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 25 counting only the distinct ones).

The product of its digits is 51438240, while the sum is 64.

Multiplying 18339659776 by its sum of digits (64), we get a square (1173738225664 = 1083392²).

18339659776 divided by its sum of digits (64) gives a square (286557184 = 16928²).

The spelling of 18339659776 in words is "eighteen billion, three hundred thirty-nine million, six hundred fifty-nine thousand, seven hundred seventy-six".