18849560025664 has 63 divisors (see below), whose sum is σ = 37634053817467. Its totient is φ = 9367314489344.

The previous prime is 18849560025661. The next prime is 18849560025671. The reversal of 18849560025664 is 46652006594881.

It is a happy number.

The square root of 18849560025664 is 4341608.

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

It can be written as a sum of positive squares in 4 ways, for example, as 16741256025664 + 2108304000000 = 4091608^2 + 1452000^2 .

It is a super-2 number, since 2×18849560025664² (a number of 27 digits) contains 22 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18849560025596 and 18849560025605.

It is not an unprimeable number, because it can be changed into a prime (18849560025661) 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, 6008783904 + ... + 6008787040.

Almost surely, 2^{18849560025664} is an apocalyptic number.

18849560025664 is the 4341608-th square number.

It is an amenable number.

18849560025664 is a deficient number, since it is larger than the sum of its proper divisors (18784493791803).

18849560025664 is an frugal number, since it uses more digits than its factorization.

18849560025664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632 (or 3312 counting only the distinct ones).

The product of its (nonzero) digits is 99532800, while the sum is 64.

18849560025664 divided by its sum of digits (64) gives a square (294524375401 = 542701²).

The spelling of 18849560025664 in words is "eighteen trillion, eight hundred forty-nine billion, five hundred sixty million, twenty-five thousand, six hundred sixty-four".