66402052 has 6 divisors (see below), whose sum is σ = 116203598. Its totient is φ = 33201024.

The previous prime is 66402043. The next prime is 66402053. The reversal of 66402052 is 25020466.

It can be written as a sum of positive squares in only one way, i.e., 57062916 + 9339136 = 7554^2 + 3056^2 .

It is not an unprimeable number, because it can be changed into a prime (66402053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300253 + ... + 8300260.

Almost surely, 2^66402052 is an apocalyptic number.

It is an amenable number.

66402052 is a deficient number, since it is larger than the sum of its proper divisors (49801546).

66402052 is a wasteful number, since it uses less digits than its factorization.

66402052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16600517 (or 16600515 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 66402052 is about 8148.7454249105. The cubic root of 66402052 is about 404.9429417153.

The spelling of 66402052 in words is "sixty-six million, four hundred two thousand, fifty-two".