669629545 has 12 divisors (see below), whose sum is σ = 870123276. Its totient is φ = 494495040.

The previous prime is 669629531. The next prime is 669629593. The reversal of 669629545 is 545926966.

It can be written as a sum of positive squares in 6 ways, for example, as 5433561 + 664195984 = 2331^2 + 25772^2 .

It is not a de Polignac number, because 669629545 - 2⁹ = 669629033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669629492 and 669629501.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 395386 + ... + 397075.

It is an arithmetic number, because the mean of its divisors is an integer number (72510273).

Almost surely, 2^669629545 is an apocalyptic number.

669629545 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

669629545 is a deficient number, since it is larger than the sum of its proper divisors (200493731).

669629545 is a wasteful number, since it uses less digits than its factorization.

669629545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792492 (or 792479 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 52.

The square root of 669629545 is about 25877.2012590234. The cubic root of 669629545 is about 874.8727085579.

The spelling of 669629545 in words is "six hundred sixty-nine million, six hundred twenty-nine thousand, five hundred forty-five".