1621751927680 has 32 divisors (see below), whose sum is σ = 3877000703640. Its totient is φ = 648700770816.

The previous prime is 1621751927657. The next prime is 1621751927681. The reversal of 1621751927680 is 867291571261.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621751927681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266993054 + ... + 1266994333.

Almost surely, 2^{1621751927680} is an apocalyptic number.

1621751927680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621751927680 is an abundant number, since it is smaller than the sum of its proper divisors (2255248775960).

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

1621751927680 is an equidigital number, since it uses as much as digits as its factorization.

1621751927680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533987406 (or 2533987394 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 1621751927680 in words is "one trillion, six hundred twenty-one billion, seven hundred fifty-one million, nine hundred twenty-seven thousand, six hundred eighty".