1620553550 has 96 divisors (see below), whose sum is σ = 3921606144. Its totient is φ = 483120000.

The previous prime is 1620553541. The next prime is 1620553559. The reversal of 1620553550 is 553550261.

It is an interprime number because it is at equal distance from previous prime (1620553541) and next prime (1620553559).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620553559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 79400 + ... + 97700.

It is an arithmetic number, because the mean of its divisors is an integer number (40850064).

Almost surely, 2^1620553550 is an apocalyptic number.

1620553550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620553550 is an abundant number, since it is smaller than the sum of its proper divisors (2301052594).

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

1620553550 is a wasteful number, since it uses less digits than its factorization.

1620553550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18354 (or 18349 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 1620553550 is about 40256.0995378340. The cubic root of 1620553550 is about 1174.5940471779.

The spelling of 1620553550 in words is "one billion, six hundred twenty million, five hundred fifty-three thousand, five hundred fifty".