16506557620 has 48 divisors (see below), whose sum is σ = 39640930560. Its totient is φ = 5655792384.

The previous prime is 16506557597. The next prime is 16506557621. The reversal of 16506557620 is 2675560561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506557621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188296 + ... + 261664.

It is an arithmetic number, because the mean of its divisors is an integer number (825852720).

Almost surely, 2^16506557620 is an apocalyptic number.

16506557620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16506557620 is an abundant number, since it is smaller than the sum of its proper divisors (23134372940).

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

16506557620 is a wasteful number, since it uses less digits than its factorization.

16506557620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74992 (or 74990 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 16506557620 in words is "sixteen billion, five hundred six million, five hundred fifty-seven thousand, six hundred twenty".