633534001201661 has 16 divisors (see below), whose sum is σ = 724228366118400. Its totient is φ = 542887031626368.

The previous prime is 633534001201559. The next prime is 633534001201669. The reversal of 633534001201661 is 166102100435336.

It is a cyclic number.

It is not a de Polignac number, because 633534001201661 - 2²⁶ = 633533934092797 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 (633534001201669) 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, 415706825 + ... + 417228033.

It is an arithmetic number, because the mean of its divisors is an integer number (45264272882400).

Almost surely, 2^{633534001201661} is an apocalyptic number.

It is an amenable number.

633534001201661 is a deficient number, since it is larger than the sum of its proper divisors (90694364916739).

633534001201661 is a wasteful number, since it uses less digits than its factorization.

633534001201661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536748.

The product of its (nonzero) digits is 233280, while the sum is 41.

Adding to 633534001201661 its reverse (166102100435336), we get a palindrome (799636101636997).

The spelling of 633534001201661 in words is "six hundred thirty-three trillion, five hundred thirty-four billion, one million, two hundred one thousand, six hundred sixty-one".