66662015652 has 18 divisors (see below), whose sum is σ = 168506761878. Its totient is φ = 22220671872.

The previous prime is 66662015633. The next prime is 66662015671. The reversal of 66662015652 is 25651026666.

It is a happy number.

66662015652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66662015633) and next prime (66662015671).

It can be written as a sum of positive squares in only one way, i.e., 66660010596 + 2005056 = 258186^2 + 1416^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 66662015598 and 66662015607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 925861293 + ... + 925861364.

It is an arithmetic number, because the mean of its divisors is an integer number (9361486771).

Almost surely, 2^66662015652 is an apocalyptic number.

It is an amenable number.

66662015652 is an abundant number, since it is smaller than the sum of its proper divisors (101844746226).

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

66662015652 is a wasteful number, since it uses less digits than its factorization.

66662015652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851722667 (or 1851722662 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 66662015652 in words is "sixty-six billion, six hundred sixty-two million, fifteen thousand, six hundred fifty-two".