669953679 has 16 divisors (see below), whose sum is σ = 953886720. Its totient is φ = 417322080.

The previous prime is 669953671. The next prime is 669953681. The reversal of 669953679 is 976359966.

It is not a de Polignac number, because 669953679 - 2³ = 669953671 is a prime.

It is a super-3 number, since 3×669953679³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669953671) 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, 121507 + ... + 126900.

It is an arithmetic number, because the mean of its divisors is an integer number (59617920).

Almost surely, 2^669953679 is an apocalyptic number.

669953679 is a deficient number, since it is larger than the sum of its proper divisors (283933041).

669953679 is a wasteful number, since it uses less digits than its factorization.

669953679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248470.

The product of its digits is 16533720, while the sum is 60.

The square root of 669953679 is about 25883.4634274473. The cubic root of 669953679 is about 875.0138464203.

It can be divided in two parts, 6699 and 53679, that added together give a triangular number (60378 = T₃₄₇).

The spelling of 669953679 in words is "six hundred sixty-nine million, nine hundred fifty-three thousand, six hundred seventy-nine".