16557033420 has 96 divisors (see below), whose sum is σ = 52146843840. Its totient is φ = 4415197248.

The previous prime is 16557033373. The next prime is 16557033433. The reversal of 16557033420 is 2433075561.

16557033420 is a `hidden beast` number, since 1 + 65 + 570 + 3 + 3 + 4 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145527 + ... + 233006.

It is an arithmetic number, because the mean of its divisors is an integer number (543196290).

Almost surely, 2^16557033420 is an apocalyptic number.

16557033420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16557033420 is an abundant number, since it is smaller than the sum of its proper divisors (35589810420).

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

16557033420 is an equidigital number, since it uses as much as digits as its factorization.

16557033420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378563 (or 378543 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The spelling of 16557033420 in words is "sixteen billion, five hundred fifty-seven million, thirty-three thousand, four hundred twenty".