1818449553001 has 9 divisors (see below), whose sum is σ = 1829895316599. Its totient is φ = 1807074963936.

The previous prime is 1818449552981. The next prime is 1818449553013. The reversal of 1818449553001 is 1003559448181.

The square root of 1818449553001 is 1348499.

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

It can be written as a sum of positive squares in only one way, i.e., 1383081842025 + 435367710976 = 1176045^2 + 659824^2 .

It is not a de Polignac number, because 1818449553001 - 2⁷ = 1818449552873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1818449559001) 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, 219801201 + ... + 219809473.

Almost surely, 2^{1818449553001} is an apocalyptic number.

1818449553001 is the 1348499-th square number.

1818449553001 is the 674250-th centered octagonal number.

It is an amenable number.

1818449553001 is a deficient number, since it is larger than the sum of its proper divisors (11445763598).

1818449553001 is an frugal number, since it uses more digits than its factorization.

1818449553001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16872 (or 8436 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 49.

Multiplying 1818449553001 by its sum of digits (49), we get a square (89104028097049 = 9439493²).

The spelling of 1818449553001 in words is "one trillion, eight hundred eighteen billion, four hundred forty-nine million, five hundred fifty-three thousand, one".