1640086816 has 12 divisors (see below), whose sum is σ = 3228920982. Its totient is φ = 820043392.

The previous prime is 1640086757. The next prime is 1640086843. The reversal of 1640086816 is 6186800461.

It can be written as a sum of positive squares in only one way, i.e., 1308992400 + 331094416 = 36180^2 + 18196^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25626325 + ... + 25626388.

Almost surely, 2^1640086816 is an apocalyptic number.

1640086816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1640086816 is a deficient number, since it is larger than the sum of its proper divisors (1588834166).

1640086816 is an equidigital number, since it uses as much as digits as its factorization.

1640086816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51252723 (or 51252715 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 1640086816 is about 40497.9853326064. The cubic root of 1640086816 is about 1179.2945165347.

The spelling of 1640086816 in words is "one billion, six hundred forty million, eighty-six thousand, eight hundred sixteen".