661306076133 has 8 divisors (see below), whose sum is σ = 884267916000. Its totient is φ = 439607476848.

The previous prime is 661306076117. The next prime is 661306076243. The reversal of 661306076133 is 331670603166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661306076133 - 2⁴ = 661306076117 is a prime.

It is a super-3 number, since 3×661306076133³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661306076533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315808923 + ... + 315811016.

It is an arithmetic number, because the mean of its divisors is an integer number (110533489500).

Almost surely, 2^661306076133 is an apocalyptic number.

It is an amenable number.

661306076133 is a deficient number, since it is larger than the sum of its proper divisors (222961839867).

661306076133 is a wasteful number, since it uses less digits than its factorization.

661306076133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631620291.

The product of its (nonzero) digits is 244944, while the sum is 42.

Adding to 661306076133 its reverse (331670603166), we get a palindrome (992976679299).

The spelling of 661306076133 in words is "six hundred sixty-one billion, three hundred six million, seventy-six thousand, one hundred thirty-three".