1640465155 has 8 divisors (see below), whose sum is σ = 2249780832. Its totient is φ = 1124890368.

The previous prime is 1640465147. The next prime is 1640465171. The reversal of 1640465155 is 5515640461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1640465155 - 2³ = 1640465147 is a prime.

It is a super-2 number, since 2×1640465155² = 5382251849538348050, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 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 in 7 ways as a sum of consecutive naturals, for example, 23435182 + ... + 23435251.

It is an arithmetic number, because the mean of its divisors is an integer number (281222604).

Almost surely, 2^1640465155 is an apocalyptic number.

1640465155 is a deficient number, since it is larger than the sum of its proper divisors (609315677).

1640465155 is an equidigital number, since it uses as much as digits as its factorization.

1640465155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46870445.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 1640465155 is about 40502.6561474677. The cubic root of 1640465155 is about 1179.3851903535.

The spelling of 1640465155 in words is "one billion, six hundred forty million, four hundred sixty-five thousand, one hundred fifty-five".