1621411466666 has 24 divisors (see below), whose sum is σ = 2717852351940. Its totient is φ = 722858357376.

The previous prime is 1621411466627. The next prime is 1621411466671. The reversal of 1621411466666 is 6666641141261.

It can be written as a sum of positive squares in 2 ways, for example, as 1621254691225 + 156775441 = 1273285^2 + 12521^2 .

It is a super-3 number, since 3×1621411466666³ (a number of 38 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66038381 + ... + 66062928.

Almost surely, 2^{1621411466666} is an apocalyptic number.

1621411466666 is a deficient number, since it is larger than the sum of its proper divisors (1096440885274).

1621411466666 is a wasteful number, since it uses less digits than its factorization.

1621411466666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132101366 (or 132101347 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The spelling of 1621411466666 in words is "one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred sixty-six thousand, six hundred sixty-six".