15540806949697 has 4 divisors (see below), whose sum is σ = 15541191102640. Its totient is φ = 15540422796756.

The previous prime is 15540806949677. The next prime is 15540806949719. The reversal of 15540806949697 is 79694960804551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15540806949697 - 2¹⁹ = 15540806425409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15540806949637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192015783 + ... + 192096700.

It is an arithmetic number, because the mean of its divisors is an integer number (3885297775660).

Almost surely, 2^{15540806949697} is an apocalyptic number.

It is an amenable number.

15540806949697 is a deficient number, since it is larger than the sum of its proper divisors (384152943).

15540806949697 is an equidigital number, since it uses as much as digits as its factorization.

15540806949697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384152942.

The product of its (nonzero) digits is 587865600, while the sum is 73.

The spelling of 15540806949697 in words is "fifteen trillion, five hundred forty billion, eight hundred six million, nine hundred forty-nine thousand, six hundred ninety-seven".