1620500021456 has 40 divisors (see below), whose sum is σ = 3276666333504. Its totient is φ = 774918129920.

The previous prime is 1620500021443. The next prime is 1620500021477. The reversal of 1620500021456 is 6541200050261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2497751 + ... + 3078921.

Almost surely, 2^{1620500021456} is an apocalyptic number.

1620500021456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1620500021456 is an abundant number, since it is smaller than the sum of its proper divisors (1656166312048).

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

1620500021456 is a wasteful number, since it uses less digits than its factorization.

1620500021456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588779 (or 588773 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 1620500021456 in words is "one trillion, six hundred twenty billion, five hundred million, twenty-one thousand, four hundred fifty-six".