66553402 has 8 divisors (see below), whose sum is σ = 105702516. Its totient is φ = 31319232.

The previous prime is 66553391. The next prime is 66553423. The reversal of 66553402 is 20435566.

It can be written as a sum of positive squares in 2 ways, for example, as 65431921 + 1121481 = 8089^2 + 1059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 978693 + ... + 978760.

Almost surely, 2^66553402 is an apocalyptic number.

66553402 is a deficient number, since it is larger than the sum of its proper divisors (39149114).

66553402 is a wasteful number, since it uses less digits than its factorization.

66553402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957472.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 66553402 is about 8158.0268447707. The cubic root of 66553402 is about 405.2503700084.

Adding to 66553402 its reverse (20435566), we get a palindrome (86988968).

The spelling of 66553402 in words is "sixty-six million, five hundred fifty-three thousand, four hundred two".