6354664570821 has 32 divisors (see below), whose sum is σ = 9828140156928. Its totient is φ = 3576924711360.

The previous prime is 6354664570763. The next prime is 6354664570823. The reversal of 6354664570821 is 1280754664536.

It is not a de Polignac number, because 6354664570821 - 2¹⁷ = 6354664439749 is a prime.

It is a super-2 number, since 2×6354664570821² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6354664570823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64015336 + ... + 64114526.

It is an arithmetic number, because the mean of its divisors is an integer number (307129379904).

Almost surely, 2^{6354664570821} is an apocalyptic number.

It is an amenable number.

6354664570821 is a deficient number, since it is larger than the sum of its proper divisors (3473475586107).

6354664570821 is a wasteful number, since it uses less digits than its factorization.

6354664570821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144801.

The product of its (nonzero) digits is 29030400, while the sum is 57.

The spelling of 6354664570821 in words is "six trillion, three hundred fifty-four billion, six hundred sixty-four million, five hundred seventy thousand, eight hundred twenty-one".