1621410545664 has 1280 divisors, whose sum is σ = 6128099208000. Its totient is φ = 424503410688.

The previous prime is 1621410545611. The next prime is 1621410545669. The reversal of 1621410545664 is 4665450141261.

1621410545664 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 41 + 0 + 545 + 6 + 64 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621410545669) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11835113404 + ... + 11835113540.

Almost surely, 2^{1621410545664} is an apocalyptic number.

1621410545664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621410545664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3064049604000).

1621410545664 is an abundant number, since it is smaller than the sum of its proper divisors (4506688662336).

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

1621410545664 is an frugal number, since it uses more digits than its factorization.

1621410545664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 1621410545664 in words is "one trillion, six hundred twenty-one billion, four hundred ten million, five hundred forty-five thousand, six hundred sixty-four".