1669947951 has 16 divisors (see below), whose sum is σ = 2545265664. Its totient is φ = 954037344.

The previous prime is 1669947947. The next prime is 1669947967. The reversal of 1669947951 is 1597499661.

It is not a de Polignac number, because 1669947951 - 2² = 1669947947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1669947891 and 1669947900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669947941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146701 + ... + 157673.

It is an arithmetic number, because the mean of its divisors is an integer number (159079104).

Almost surely, 2^1669947951 is an apocalyptic number.

1669947951 is a deficient number, since it is larger than the sum of its proper divisors (875317713).

1669947951 is a wasteful number, since it uses less digits than its factorization.

1669947951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18230.

The product of its digits is 3674160, while the sum is 57.

The square root of 1669947951 is about 40864.9966474977. The cubic root of 1669947951 is about 1186.4086699867.

The spelling of 1669947951 in words is "one billion, six hundred sixty-nine million, nine hundred forty-seven thousand, nine hundred fifty-one".