66125133620 has 72 divisors (see below), whose sum is σ = 171847154304. Its totient is φ = 20927507328.

The previous prime is 66125133611. The next prime is 66125133671. The reversal of 66125133620 is 2633152166.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1373744 + ... + 1421063.

It is an arithmetic number, because the mean of its divisors is an integer number (2386766032).

Almost surely, 2^66125133620 is an apocalyptic number.

It is an amenable number.

66125133620 is an abundant number, since it is smaller than the sum of its proper divisors (105722020684).

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

66125133620 is a wasteful number, since it uses less digits than its factorization.

66125133620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794849 (or 2794834 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 66125133620 its reverse (2633152166), we get a palindrome (68758285786).

The spelling of 66125133620 in words is "sixty-six billion, one hundred twenty-five million, one hundred thirty-three thousand, six hundred twenty".