1620554125550 has 96 divisors (see below), whose sum is σ = 3121886124000. Its totient is φ = 625384488960.

The previous prime is 1620554125511. The next prime is 1620554125571. The reversal of 1620554125550 is 555214550261.

It is a junction number, because it is equal to n+sod(n) for n = 1620554125498 and 1620554125507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135389966 + ... + 135401934.

It is an arithmetic number, because the mean of its divisors is an integer number (32519647125).

Almost surely, 2^{1620554125550} is an apocalyptic number.

1620554125550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620554125550 is a deficient number, since it is larger than the sum of its proper divisors (1501331998450).

1620554125550 is a wasteful number, since it uses less digits than its factorization.

1620554125550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12630 (or 12625 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 41.

The spelling of 1620554125550 in words is "one trillion, six hundred twenty billion, five hundred fifty-four million, one hundred twenty-five thousand, five hundred fifty".