66613626461 has 8 divisors (see below), whose sum is σ = 67572128448. Its totient is φ = 65655688000.

The previous prime is 66613626451. The next prime is 66613626511. The reversal of 66613626461 is 16462631666.

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

It is a de Polignac number, because none of the positive numbers 2^k-66613626461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613626451) 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, 100181 + ... + 378501.

It is an arithmetic number, because the mean of its divisors is an integer number (8446516056).

Almost surely, 2^66613626461 is an apocalyptic number.

It is an amenable number.

66613626461 is a deficient number, since it is larger than the sum of its proper divisors (958501987).

66613626461 is a wasteful number, since it uses less digits than its factorization.

66613626461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281763.

The product of its digits is 1119744, while the sum is 47.

The spelling of 66613626461 in words is "sixty-six billion, six hundred thirteen million, six hundred twenty-six thousand, four hundred sixty-one".