1640162897 has 4 divisors (see below), whose sum is σ = 1726487280. Its totient is φ = 1553838516.

The previous prime is 1640162891. The next prime is 1640162903. The reversal of 1640162897 is 7982610461.

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.

It is an interprime number because it is at equal distance from previous prime (1640162891) and next prime (1640162903).

It is a cyclic number.

It is not a de Polignac number, because 1640162897 - 2¹² = 1640158801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640162891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43162163 + ... + 43162200.

It is an arithmetic number, because the mean of its divisors is an integer number (431621820).

Almost surely, 2^1640162897 is an apocalyptic number.

It is an amenable number.

1640162897 is a deficient number, since it is larger than the sum of its proper divisors (86324383).

1640162897 is an equidigital number, since it uses as much as digits as its factorization.

1640162897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86324382.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 1640162897 is about 40498.9246400445. The cubic root of 1640162897 is about 1179.3127514472.

The spelling of 1640162897 in words is "one billion, six hundred forty million, one hundred sixty-two thousand, eight hundred ninety-seven".