66472740642 has 128 divisors (see below), whose sum is σ = 169096531968. Its totient is φ = 16920576000.

The previous prime is 66472740617. The next prime is 66472740671. The reversal of 66472740642 is 24604727466.

It is a happy number.

66472740642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66472740591 and 66472740600.

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, 4608642 + ... + 4623042.

It is an arithmetic number, because the mean of its divisors is an integer number (1321066656).

Almost surely, 2^66472740642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66472740642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84548265984).

66472740642 is an abundant number, since it is smaller than the sum of its proper divisors (102623791326).

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

66472740642 is a wasteful number, since it uses less digits than its factorization.

66472740642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14624.

The product of its (nonzero) digits is 2709504, while the sum is 48.

The spelling of 66472740642 in words is "sixty-six billion, four hundred seventy-two million, seven hundred forty thousand, six hundred forty-two".