1640495616 has 80 divisors (see below), whose sum is σ = 4382532000. Its totient is φ = 545312768.

The previous prime is 1640495611. The next prime is 1640495621. The reversal of 1640495616 is 6165940461.

It is an interprime number because it is at equal distance from previous prime (1640495611) and next prime (1640495621).

It is a super-2 number, since 2×1640495616² = 5382451732230438912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1640495611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642310 + ... + 644858.

It is an arithmetic number, because the mean of its divisors is an integer number (54781650).

Almost surely, 2^1640495616 is an apocalyptic number.

1640495616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640495616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2191266000).

1640495616 is an abundant number, since it is smaller than the sum of its proper divisors (2742036384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640495616 is an equidigital number, since it uses as much as digits as its factorization.

1640495616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2989 (or 2973 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 1640495616 is about 40503.0321827885. The cubic root of 1640495616 is about 1179.3924901184.

The spelling of 1640495616 in words is "one billion, six hundred forty million, four hundred ninety-five thousand, six hundred sixteen".