15649656334645 has 8 divisors (see below), whose sum is σ = 19884269225304. Its totient is φ = 11783270651904.

The previous prime is 15649656334639. The next prime is 15649656334649. The reversal of 15649656334645 is 54643365694651.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 311647528516 + 15338008806129 = 558254^2 + 3916377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15649656334645 - 2¹⁹ = 15649655810357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15649656334649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92056801884 + ... + 92056802053.

It is an arithmetic number, because the mean of its divisors is an integer number (2485533653163).

Almost surely, 2^{15649656334645} is an apocalyptic number.

It is an amenable number.

15649656334645 is a deficient number, since it is larger than the sum of its proper divisors (4234612890659).

15649656334645 is a wasteful number, since it uses less digits than its factorization.

15649656334645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184113603959.

The product of its digits is 839808000, while the sum is 67.

The spelling of 15649656334645 in words is "fifteen trillion, six hundred forty-nine billion, six hundred fifty-six million, three hundred thirty-four thousand, six hundred forty-five".