620066666 has 4 divisors (see below), whose sum is σ = 930100002. Its totient is φ = 310033332.

The previous prime is 620066651. The next prime is 620066677. The reversal of 620066666 is 666660026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666660026 = 2 ⋅333330013.

It can be written as a sum of positive squares in only one way, i.e., 377486041 + 242580625 = 19429^2 + 15575^2 .

620066666 is a modest number, since divided by 66666 gives 6200 as remainder.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155016665 + ... + 155016668.

Almost surely, 2^620066666 is an apocalyptic number.

620066666 is a deficient number, since it is larger than the sum of its proper divisors (310033336).

620066666 is a wasteful number, since it uses less digits than its factorization.

620066666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310033335.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 620066666 is about 24901.1378454881. The cubic root of 620066666 is about 852.7324597192.

The spelling of 620066666 in words is "six hundred twenty million, sixty-six thousand, six hundred sixty-six".