190649666 has 4 divisors (see below), whose sum is σ = 285974502. Its totient is φ = 95324832.

The previous prime is 190649663. The next prime is 190649677. The reversal of 190649666 is 666946091.

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., 183738025 + 6911641 = 13555^2 + 2629^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 190649666.

It is not an unprimeable number, because it can be changed into a prime (190649663) by changing a digit.

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 as a sum of consecutive naturals, namely, 47662415 + ... + 47662418.

Almost surely, 2^190649666 is an apocalyptic number.

190649666 is a deficient number, since it is larger than the sum of its proper divisors (95324836).

190649666 is an equidigital number, since it uses as much as digits as its factorization.

190649666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95324835.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 190649666 is about 13807.5945044747. The cubic root of 190649666 is about 575.5442016089.

The spelling of 190649666 in words is "one hundred ninety million, six hundred forty-nine thousand, six hundred sixty-six".