1669780147 has 4 divisors (see below), whose sum is σ = 1908320176. Its totient is φ = 1431240120.

The previous prime is 1669780129. The next prime is 1669780153. The reversal of 1669780147 is 7410879661.

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

It is a cyclic number.

It is not a de Polignac number, because 1669780147 - 2²³ = 1661391539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1669780147.

It is not an unprimeable number, because it can be changed into a prime (1669780117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119270004 + ... + 119270017.

It is an arithmetic number, because the mean of its divisors is an integer number (477080044).

Almost surely, 2^1669780147 is an apocalyptic number.

1669780147 is a deficient number, since it is larger than the sum of its proper divisors (238540029).

1669780147 is an equidigital number, since it uses as much as digits as its factorization.

1669780147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238540028.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 1669780147 is about 40862.9434451313. The cubic root of 1669780147 is about 1186.3689300677.

The spelling of 1669780147 in words is "one billion, six hundred sixty-nine million, seven hundred eighty thousand, one hundred forty-seven".