6661554 has 24 divisors (see below), whose sum is σ = 13709808. Its totient is φ = 2157840.

The previous prime is 6661553. The next prime is 6661583. The reversal of 6661554 is 4551666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6661553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7809 + ... + 8619.

It is an arithmetic number, because the mean of its divisors is an integer number (571242).

Almost surely, 2^6661554 is an apocalyptic number.

6661554 is an abundant number, since it is smaller than the sum of its proper divisors (7048254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661554 is a wasteful number, since it uses less digits than its factorization.

6661554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 853 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 6661554 is about 2580.9986439361. The cubic root of 6661554 is about 188.1590814366.

The spelling of 6661554 in words is "six million, six hundred sixty-one thousand, five hundred fifty-four".