1620366452640 has 768 divisors, whose sum is σ = 6218311680000. Its totient is φ = 391664553984.

The previous prime is 1620366452581. The next prime is 1620366452669. The reversal of 1620366452640 is 462546630261.

It is a happy number.

1620366452640 is a `hidden beast` number, since 1 + 6 + 20 + 3 + 6 + 64 + 526 + 40 = 666.

It is a super-2 number, since 2×1620366452640² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1877596849 + ... + 1877597711.

It is an arithmetic number, because the mean of its divisors is an integer number (8096760000).

Almost surely, 2^{1620366452640} is an apocalyptic number.

1620366452640 is a gapful number since it is divisible by the number (10) 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 1620366452640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3109155840000).

1620366452640 is an abundant number, since it is smaller than the sum of its proper divisors (4597945227360).

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

1620366452640 is a wasteful number, since it uses less digits than its factorization.

1620366452640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466 (or 1452 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 1620366452640 in words is "one trillion, six hundred twenty billion, three hundred sixty-six million, four hundred fifty-two thousand, six hundred forty".