15781346427 has 32 divisors (see below), whose sum is σ = 26260992000. Its totient is φ = 8189644320.

The previous prime is 15781346389. The next prime is 15781346447. The reversal of 15781346427 is 72464318751.

It is not a de Polignac number, because 15781346427 - 2⁷ = 15781346299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15781346447) 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 in 31 ways as a sum of consecutive naturals, for example, 192324 + ... + 261822.

It is an arithmetic number, because the mean of its divisors is an integer number (820656000).

Almost surely, 2^15781346427 is an apocalyptic number.

15781346427 is a deficient number, since it is larger than the sum of its proper divisors (10479645573).

15781346427 is a wasteful number, since it uses less digits than its factorization.

15781346427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70503.

The product of its digits is 1128960, while the sum is 48.

The spelling of 15781346427 in words is "fifteen billion, seven hundred eighty-one million, three hundred forty-six thousand, four hundred twenty-seven".