1668618062500 has 63 divisors (see below), whose sum is σ = 3650761843869. Its totient is φ = 667318050000.

The previous prime is 1668618062479. The next prime is 1668618062521. The reversal of 1668618062500 is 52608168661.

The square root of 1668618062500 is 1291750.

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 (1668618062479) and next prime (1668618062521).

It can be written as a sum of positive squares in 3 ways, for example, as 1461869610084 + 206748452416 = 1209078^2 + 454696^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 322934917 + ... + 322940083.

Almost surely, 2^{1668618062500} is an apocalyptic number.

1668618062500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668618062500 is the 1291750-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668618062500

1668618062500 is an abundant number, since it is smaller than the sum of its proper divisors (1982143781369).

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

1668618062500 is an frugal number, since it uses more digits than its factorization.

1668618062500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10368 (or 5174 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

Multiplying 1668618062500 by its sum of digits (49), we get a square (81762285062500 = 9042250²).

The spelling of 1668618062500 in words is "one trillion, six hundred sixty-eight billion, six hundred eighteen million, sixty-two thousand, five hundred".