1664651830 has 16 divisors (see below), whose sum is σ = 3077357040. Its totient is φ = 647864352.

The previous prime is 1664651803. The next prime is 1664651839. The reversal of 1664651830 is 381564661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664651839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2249160 + ... + 2249899.

It is an arithmetic number, because the mean of its divisors is an integer number (192334815).

Almost surely, 2^1664651830 is an apocalyptic number.

1664651830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664651830 is a deficient number, since it is larger than the sum of its proper divisors (1412705210).

1664651830 is a wasteful number, since it uses less digits than its factorization.

1664651830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499103.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1664651830 is about 40800.1449752326. The cubic root of 1664651830 is about 1185.1531382380.

The spelling of 1664651830 in words is "one billion, six hundred sixty-four million, six hundred fifty-one thousand, eight hundred thirty".