16557557541 has 32 divisors (see below), whose sum is σ = 26906987520. Its totient is φ = 8840814336.

The previous prime is 16557557537. The next prime is 16557557557. The reversal of 16557557541 is 14575575561.

It is not a de Polignac number, because 16557557541 - 2² = 16557557537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557557501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117211 + ... + 216456.

It is an arithmetic number, because the mean of its divisors is an integer number (840843360).

Almost surely, 2^16557557541 is an apocalyptic number.

It is an amenable number.

16557557541 is a deficient number, since it is larger than the sum of its proper divisors (10349429979).

16557557541 is a wasteful number, since it uses less digits than its factorization.

16557557541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333833.

The product of its digits is 3675000, while the sum is 51.

The spelling of 16557557541 in words is "sixteen billion, five hundred fifty-seven million, five hundred fifty-seven thousand, five hundred forty-one".