6021553661 has 8 divisors (see below), whose sum is σ = 6187407744. Its totient is φ = 5857272000.

The previous prime is 6021553631. The next prime is 6021553667. The reversal of 6021553661 is 1663551206.

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-6021553661 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 (6021553667) 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, 385340 + ... + 400661.

It is an arithmetic number, because the mean of its divisors is an integer number (773425968).

Almost surely, 2^6021553661 is an apocalyptic number.

It is an amenable number.

6021553661 is a deficient number, since it is larger than the sum of its proper divisors (165854083).

6021553661 is a wasteful number, since it uses less digits than its factorization.

6021553661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786211.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 6021553661 is about 77598.6704847448. The cubic root of 6021553661 is about 1819.2938593172.

The spelling of 6021553661 in words is "six billion, twenty-one million, five hundred fifty-three thousand, six hundred sixty-one".