4151728561821 has 16 divisors (see below), whose sum is σ = 5606995676160. Its totient is φ = 2732156322480.

The previous prime is 4151728561793. The next prime is 4151728561829. The reversal of 4151728561821 is 1281658271514.

It is a happy number.

It is not a de Polignac number, because 4151728561821 - 2⁷ = 4151728561693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4151728561829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 973515 + ... + 3041576.

It is an arithmetic number, because the mean of its divisors is an integer number (350437229760).

Almost surely, 2^{4151728561821} is an apocalyptic number.

It is an amenable number.

4151728561821 is a deficient number, since it is larger than the sum of its proper divisors (1455267114339).

4151728561821 is a wasteful number, since it uses less digits than its factorization.

4151728561821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4019536.

The product of its digits is 1075200, while the sum is 51.

The spelling of 4151728561821 in words is "four trillion, one hundred fifty-one billion, seven hundred twenty-eight million, five hundred sixty-one thousand, eight hundred twenty-one".