6661572 has 36 divisors (see below), whose sum is σ = 15971760. Its totient is φ = 2160384.

The previous prime is 6661553. The next prime is 6661583. The reversal of 6661572 is 2751666.

It is a super-2 number, since 2×6661572² = 88753083022368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68628 + ... + 68724.

It is an arithmetic number, because the mean of its divisors is an integer number (443660).

Almost surely, 2^6661572 is an apocalyptic number.

It is an amenable number.

6661572 is an abundant number, since it is smaller than the sum of its proper divisors (9310188).

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

6661572 is a wasteful number, since it uses less digits than its factorization.

6661572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 161 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 6661572 is about 2581.0021309561. The cubic root of 6661572 is about 188.1592509095.

The spelling of 6661572 in words is "six million, six hundred sixty-one thousand, five hundred seventy-two".