1640430053 has 4 divisors (see below), whose sum is σ = 1655479980. Its totient is φ = 1625380128.

The previous prime is 1640430047. The next prime is 1640430059. The reversal of 1640430053 is 3500340461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3500340461 = 11783 ⋅297067.

It is an interprime number because it is at equal distance from previous prime (1640430047) and next prime (1640430059).

It can be written as a sum of positive squares in 2 ways, for example, as 1431714244 + 208715809 = 37838^2 + 14447^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640430053 - 2²⁰ = 1639381477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640430059) 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, 7524800 + ... + 7525017.

It is an arithmetic number, because the mean of its divisors is an integer number (413869995).

Almost surely, 2^1640430053 is an apocalyptic number.

It is an amenable number.

1640430053 is a deficient number, since it is larger than the sum of its proper divisors (15049927).

1640430053 is a wasteful number, since it uses less digits than its factorization.

1640430053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15049926.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1640430053 is about 40502.2228155443. Note that the first 3 decimals coincide. The cubic root of 1640430053 is about 1179.3767782934.

The spelling of 1640430053 in words is "one billion, six hundred forty million, four hundred thirty thousand, fifty-three".