1621480799956 has 12 divisors (see below), whose sum is σ = 2854582966368. Its totient is φ = 805885666712.

The previous prime is 1621480799933. The next prime is 1621480799963. The reversal of 1621480799956 is 6599970841261.

It is a junction number, because it is equal to n+sod(n) for n = 1621480799891 and 1621480799900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213682566 + ... + 1213683901.

It is an arithmetic number, because the mean of its divisors is an integer number (237881913864).

Almost surely, 2^{1621480799956} is an apocalyptic number.

It is an amenable number.

1621480799956 is a deficient number, since it is larger than the sum of its proper divisors (1233102166412).

1621480799956 is a wasteful number, since it uses less digits than its factorization.

1621480799956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427366638 (or 2427366636 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 67.

The spelling of 1621480799956 in words is "one trillion, six hundred twenty-one billion, four hundred eighty million, seven hundred ninety-nine thousand, nine hundred fifty-six".