16556342377 has 2 divisors, whose sum is σ = 16556342378. Its totient is φ = 16556342376.

The previous prime is 16556342339. The next prime is 16556342399. The reversal of 16556342377 is 77324365561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11219893776 + 5336448601 = 105924^2 + 73051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16556342377 is a prime.

It is a super-2 number, since 2×16556342377² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16556342377.

It is not a weakly prime, because it can be changed into another prime (16556342317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278171188 + 8278171189.

It is an arithmetic number, because the mean of its divisors is an integer number (8278171189).

Almost surely, 2^16556342377 is an apocalyptic number.

It is an amenable number.

16556342377 is a deficient number, since it is larger than the sum of its proper divisors (1).

16556342377 is an equidigital number, since it uses as much as digits as its factorization.

16556342377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 49.

The spelling of 16556342377 in words is "sixteen billion, five hundred fifty-six million, three hundred forty-two thousand, three hundred seventy-seven".