66155434 has 4 divisors (see below), whose sum is σ = 99233154. Its totient is φ = 33077716.

The previous prime is 66155423. The next prime is 66155471. The reversal of 66155434 is 43455166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 53217025 + 12938409 = 7295^2 + 3597^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66155434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16538857 + ... + 16538860.

Almost surely, 2^66155434 is an apocalyptic number.

66155434 is a deficient number, since it is larger than the sum of its proper divisors (33077720).

66155434 is a wasteful number, since it uses less digits than its factorization.

66155434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33077719.

The product of its digits is 43200, while the sum is 34.

The square root of 66155434 is about 8133.5990803580. The cubic root of 66155434 is about 404.4409988492.

The spelling of 66155434 in words is "sixty-six million, one hundred fifty-five thousand, four hundred thirty-four".