15540806949677 has 2 divisors, whose sum is σ = 15540806949678. Its totient is φ = 15540806949676.

The previous prime is 15540806949659. The next prime is 15540806949719. The reversal of 15540806949677 is 77694960804551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10072079711716 + 5468727237961 = 3173654^2 + 2338531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15540806949677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15540806949677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15540806949637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7770403474838 + 7770403474839.

It is an arithmetic number, because the mean of its divisors is an integer number (7770403474839).

Almost surely, 2^{15540806949677} is an apocalyptic number.

It is an amenable number.

15540806949677 is a deficient number, since it is larger than the sum of its proper divisors (1).

15540806949677 is an equidigital number, since it uses as much as digits as its factorization.

15540806949677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 457228800, while the sum is 71.

The spelling of 15540806949677 in words is "fifteen trillion, five hundred forty billion, eight hundred six million, nine hundred forty-nine thousand, six hundred seventy-seven".