1669497650 has 24 divisors (see below), whose sum is σ = 3107094660. Its totient is φ = 667405760.

The previous prime is 1669497629. The next prime is 1669497673. The reversal of 1669497650 is 567949661.

It can be written as a sum of positive squares in 6 ways, for example, as 1219336561 + 450161089 = 34919^2 + 21217^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1669497592 and 1669497601.

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, 84956 + ... + 102744.

Almost surely, 2^1669497650 is an apocalyptic number.

1669497650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1669497650 is a deficient number, since it is larger than the sum of its proper divisors (1437597010).

1669497650 is a wasteful number, since it uses less digits than its factorization.

1669497650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19678 (or 19673 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 1669497650 is about 40859.4866585472. The cubic root of 1669497650 is about 1186.3020221445.

The spelling of 1669497650 in words is "one billion, six hundred sixty-nine million, four hundred ninety-seven thousand, six hundred fifty".