4521201661764 has 18 divisors (see below), whose sum is σ = 11428593089550. Its totient is φ = 1507067220576.

The previous prime is 4521201661763. The next prime is 4521201661777. The reversal of 4521201661764 is 4671661021254.

4521201661764 is a `hidden beast` number, since 4 + 5 + 2 + 1 + 20 + 1 + 6 + 617 + 6 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4266538113600 + 254663548164 = 2065560^2 + 504642^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (4521201661763) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62794467489 + ... + 62794467560.

Almost surely, 2^{4521201661764} is an apocalyptic number.

It is an amenable number.

4521201661764 is an abundant number, since it is smaller than the sum of its proper divisors (6907391427786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4521201661764 is a wasteful number, since it uses less digits than its factorization.

4521201661764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125588935059 (or 125588935054 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 4521201661764 in words is "four trillion, five hundred twenty-one billion, two hundred one million, six hundred sixty-one thousand, seven hundred sixty-four".