7421355561 has 8 divisors (see below), whose sum is σ = 9907559424. Its totient is φ = 4941361040.

The previous prime is 7421355553. The next prime is 7421355563. The reversal of 7421355561 is 1655531247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7421355561 - 2³ = 7421355553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7421355563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1549545 + ... + 1554326.

It is an arithmetic number, because the mean of its divisors is an integer number (1238444928).

Almost surely, 2^7421355561 is an apocalyptic number.

It is an amenable number.

7421355561 is a deficient number, since it is larger than the sum of its proper divisors (2486203863).

7421355561 is a wasteful number, since it uses less digits than its factorization.

7421355561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104671.

The product of its digits is 126000, while the sum is 39.

The square root of 7421355561 is about 86147.2899225507. The cubic root of 7421355561 is about 1950.5679310913.

The spelling of 7421355561 in words is "seven billion, four hundred twenty-one million, three hundred fifty-five thousand, five hundred sixty-one".