66620994 has 32 divisors (see below), whose sum is σ = 153907776. Its totient is φ = 19000320.

The previous prime is 66620987. The next prime is 66621001. The reversal of 66620994 is 49902666.

66620994 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 (66620987) and next prime (66621001).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28567 + ... + 30810.

It is an arithmetic number, because the mean of its divisors is an integer number (4809618).

Almost surely, 2^66620994 is an apocalyptic number.

66620994 is an abundant number, since it is smaller than the sum of its proper divisors (87286782).

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

66620994 is a wasteful number, since it uses less digits than its factorization.

66620994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59410.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 66620994 is about 8162.1684618734. The cubic root of 66620994 is about 405.3875150897.

It can be divided in two parts, 66 and 620994, that multiplied together give a square (40985604 = 6402²).

The spelling of 66620994 in words is "sixty-six million, six hundred twenty thousand, nine hundred ninety-four".