1640133347 has 4 divisors (see below), whose sum is σ = 1641274560. Its totient is φ = 1638992136.

The previous prime is 1640133311. The next prime is 1640133349. The reversal of 1640133347 is 7433310461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7433310461 = 3929 ⋅1891909.

It is a cyclic number.

It is not a de Polignac number, because 1640133347 - 2⁸ = 1640133091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640133349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568448 + ... + 571325.

It is an arithmetic number, because the mean of its divisors is an integer number (410318640).

Almost surely, 2^1640133347 is an apocalyptic number.

1640133347 is a deficient number, since it is larger than the sum of its proper divisors (1141213).

1640133347 is a wasteful number, since it uses less digits than its factorization.

1640133347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141212.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 1640133347 is about 40498.5598138996. The cubic root of 1640133347 is about 1179.3056690407.

The spelling of 1640133347 in words is "one billion, six hundred forty million, one hundred thirty-three thousand, three hundred forty-seven".