15691361234057 has 4 divisors (see below), whose sum is σ = 15691389969156. Its totient is φ = 15691332498960.

The previous prime is 15691361234053. The next prime is 15691361234089. The reversal of 15691361234057 is 75043216319651.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13787676006976 + 1903685227081 = 3713176^2 + 1379741^2 .

It is a cyclic number.

It is not a de Polignac number, because 15691361234057 - 2² = 15691361234053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15691361234053) 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 3 ways as a sum of consecutive naturals, for example, 13532258 + ... + 14645979.

It is an arithmetic number, because the mean of its divisors is an integer number (3922847492289).

Almost surely, 2^{15691361234057} is an apocalyptic number.

It is an amenable number.

15691361234057 is a deficient number, since it is larger than the sum of its proper divisors (28735099).

15691361234057 is an equidigital number, since it uses as much as digits as its factorization.

15691361234057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28735098.

The product of its (nonzero) digits is 4082400, while the sum is 53.

The spelling of 15691361234057 in words is "fifteen trillion, six hundred ninety-one billion, three hundred sixty-one million, two hundred thirty-four thousand, fifty-seven".