16556343401 has 24 divisors (see below), whose sum is σ = 19265999904. Its totient is φ = 14168943360.

The previous prime is 16556343389. The next prime is 16556343403. The reversal of 16556343401 is 10434365561.

It is not a de Polignac number, because 16556343401 - 2¹⁰ = 16556342377 is a prime.

It is a super-2 number, since 2×16556343401² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16556343403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149486 + ... + 235496.

It is an arithmetic number, because the mean of its divisors is an integer number (802749996).

Almost surely, 2^16556343401 is an apocalyptic number.

It is an amenable number.

16556343401 is a deficient number, since it is larger than the sum of its proper divisors (2709656503).

16556343401 is a wasteful number, since it uses less digits than its factorization.

16556343401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86121 (or 86108 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 16556343401 in words is "sixteen billion, five hundred fifty-six million, three hundred forty-three thousand, four hundred one".