66513350670 has 128 divisors (see below), whose sum is σ = 175548691584. Its totient is φ = 16029425664.

The previous prime is 66513350647. The next prime is 66513350689. The reversal of 66513350670 is 7605331566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3891864 + ... + 3908916.

It is an arithmetic number, because the mean of its divisors is an integer number (1371474153).

Almost surely, 2^66513350670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66513350670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87774345792).

66513350670 is an abundant number, since it is smaller than the sum of its proper divisors (109035340914).

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

66513350670 is a wasteful number, since it uses less digits than its factorization.

66513350670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17286.

The product of its (nonzero) digits is 340200, while the sum is 42.

The spelling of 66513350670 in words is "sixty-six billion, five hundred thirteen million, three hundred fifty thousand, six hundred seventy".