1621662740352 has 64 divisors (see below), whose sum is σ = 4786157403600. Its totient is φ = 540554245632.

The previous prime is 1621662740293. The next prime is 1621662740353. The reversal of 1621662740352 is 2530472661261.

1621662740352 is a `hidden beast` number, since 1 + 6 + 2 + 16 + 627 + 4 + 0 + 3 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1621662740298 and 1621662740307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621662740353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234612103 + ... + 234619014.

Almost surely, 2^{1621662740352} is an apocalyptic number.

1621662740352 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621662740352 is an abundant number, since it is smaller than the sum of its proper divisors (3164494663248).

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

1621662740352 is an equidigital number, since it uses as much as digits as its factorization.

1621662740352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469231140 (or 469231122 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 1621662740352 in words is "one trillion, six hundred twenty-one billion, six hundred sixty-two million, seven hundred forty thousand, three hundred fifty-two".