2621434553 has 4 divisors (see below), whose sum is σ = 2622215568. Its totient is φ = 2620653540.

The previous prime is 2621434547. The next prime is 2621434577. The reversal of 2621434553 is 3554341262.

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 a cyclic number.

It is not a de Polignac number, because 2621434553 - 2¹⁶ = 2621369017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621434853) 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, 385451 + ... + 392192.

It is an arithmetic number, because the mean of its divisors is an integer number (655553892).

Almost surely, 2^2621434553 is an apocalyptic number.

It is an amenable number.

2621434553 is a deficient number, since it is larger than the sum of its proper divisors (781015).

2621434553 is an equidigital number, since it uses as much as digits as its factorization.

2621434553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781014.

The product of its digits is 86400, while the sum is 35.

The square root of 2621434553 is about 51199.9468066130. The cubic root of 2621434553 is about 1378.8372466063.

The spelling of 2621434553 in words is "two billion, six hundred twenty-one million, four hundred thirty-four thousand, five hundred fifty-three".