2640357433 has 4 divisors (see below), whose sum is σ = 3017551360. Its totient is φ = 2263163508.

The previous prime is 2640357409. The next prime is 2640357437. The reversal of 2640357433 is 3347530462.

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: 3347530462 = 2 ⋅1673765231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640357433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2640357392 and 2640357401.

It is not an unprimeable number, because it can be changed into a prime (2640357437) 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, 188596953 + ... + 188596966.

It is an arithmetic number, because the mean of its divisors is an integer number (754387840).

Almost surely, 2^2640357433 is an apocalyptic number.

It is an amenable number.

2640357433 is a deficient number, since it is larger than the sum of its proper divisors (377193927).

2640357433 is an equidigital number, since it uses as much as digits as its factorization.

2640357433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377193926.

The product of its (nonzero) digits is 181440, while the sum is 37.

The square root of 2640357433 is about 51384.4084621006. The cubic root of 2640357433 is about 1382.1470172609.

Adding to 2640357433 its reverse (3347530462), we get a palindrome (5987887895).

The spelling of 2640357433 in words is "two billion, six hundred forty million, three hundred fifty-seven thousand, four hundred thirty-three".