1640335377 has 4 divisors (see below), whose sum is σ = 2187113840. Its totient is φ = 1093556916.

The previous prime is 1640335373. The next prime is 1640335399. The reversal of 1640335377 is 7735330461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7735330461 = 3 ⋅2578443487.

It is not a de Polignac number, because 1640335377 - 2² = 1640335373 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640335373) 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 3 ways as a sum of consecutive naturals, for example, 273389227 + ... + 273389232.

It is an arithmetic number, because the mean of its divisors is an integer number (546778460).

Almost surely, 2^1640335377 is an apocalyptic number.

It is an amenable number.

1640335377 is a deficient number, since it is larger than the sum of its proper divisors (546778463).

1640335377 is an equidigital number, since it uses as much as digits as its factorization.

1640335377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546778462.

The product of its (nonzero) digits is 158760, while the sum is 39.

The square root of 1640335377 is about 40501.0540233214. The cubic root of 1640335377 is about 1179.3540889538.

The spelling of 1640335377 in words is "one billion, six hundred forty million, three hundred thirty-five thousand, three hundred seventy-seven".