7421005661 has 8 divisors (see below), whose sum is σ = 7671875904. Its totient is φ = 7173694080.

The previous prime is 7421005633. The next prime is 7421005723. The reversal of 7421005661 is 1665001247.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7421005661 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 (7421005601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 885425 + ... + 893766.

It is an arithmetic number, because the mean of its divisors is an integer number (958984488).

Almost surely, 2^7421005661 is an apocalyptic number.

It is an amenable number.

7421005661 is a deficient number, since it is larger than the sum of its proper divisors (250870243).

7421005661 is a wasteful number, since it uses less digits than its factorization.

7421005661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779331.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 7421005661 is about 86145.2590744261. The cubic root of 7421005661 is about 1950.5372756655.

The spelling of 7421005661 in words is "seven billion, four hundred twenty-one million, five thousand, six hundred sixty-one".