1646330651 has 24 divisors (see below), whose sum is σ = 1948413600. Its totient is φ = 1362604032.

The previous prime is 1646330627. The next prime is 1646330663. The reversal of 1646330651 is 1560336461.

It is a de Polignac number, because none of the positive numbers 2^k-1646330651 is a prime.

It is a super-2 number, since 2×1646330651² = 5420809224844167602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1646330681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1427291 + ... + 1428443.

It is an arithmetic number, because the mean of its divisors is an integer number (81183900).

Almost surely, 2^1646330651 is an apocalyptic number.

1646330651 is a deficient number, since it is larger than the sum of its proper divisors (302082949).

1646330651 is a wasteful number, since it uses less digits than its factorization.

1646330651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 1646330651 is about 40575.0003203943. Note that the first 3 decimals coincide. The cubic root of 1646330651 is about 1180.7891520480.

The spelling of 1646330651 in words is "one billion, six hundred forty-six million, three hundred thirty thousand, six hundred fifty-one".