3547857606821 has 16 divisors (see below), whose sum is σ = 3873040695168. Its totient is φ = 3223117094400.

The previous prime is 3547857606817. The next prime is 3547857606829. The reversal of 3547857606821 is 1286067587453.

It is a cyclic number.

It is not a de Polignac number, because 3547857606821 - 2² = 3547857606817 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 (3547857606829) 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, 102780461 + ... + 102814973.

It is an arithmetic number, because the mean of its divisors is an integer number (242065043448).

Almost surely, 2^{3547857606821} is an apocalyptic number.

It is an amenable number.

3547857606821 is a deficient number, since it is larger than the sum of its proper divisors (325183088347).

3547857606821 is a wasteful number, since it uses less digits than its factorization.

3547857606821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40652.

The product of its (nonzero) digits is 67737600, while the sum is 62.

The spelling of 3547857606821 in words is "three trillion, five hundred forty-seven billion, eight hundred fifty-seven million, six hundred six thousand, eight hundred twenty-one".