66949850 has 24 divisors (see below), whose sum is σ = 135848448. Its totient is φ = 24345200.

The previous prime is 66949847. The next prime is 66949853. The reversal of 66949850 is 5894966.

It is an interprime number because it is at equal distance from previous prime (66949847) and next prime (66949853).

It is a junction number, because it is equal to n+sod(n) for n = 66949795 and 66949804.

It is not an unprimeable number, because it can be changed into a prime (66949853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60314 + ... + 61413.

It is an arithmetic number, because the mean of its divisors is an integer number (5660352).

Almost surely, 2^66949850 is an apocalyptic number.

66949850 is an abundant number, since it is smaller than the sum of its proper divisors (68898598).

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

66949850 is a wasteful number, since it uses less digits than its factorization.

66949850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121750 (or 121745 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 66949850 is about 8182.2887995964. The cubic root of 66949850 is about 406.0534481149.

The spelling of 66949850 in words is "sixty-six million, nine hundred forty-nine thousand, eight hundred fifty".