6661751408 has 20 divisors (see below), whose sum is σ = 13900000968. Its totient is φ = 3074654400.

The previous prime is 6661751389. The next prime is 6661751431. The reversal of 6661751408 is 8041571666.

It is a super-3 number, since 3×6661751408³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16013618 + ... + 16014033.

Almost surely, 2^6661751408 is an apocalyptic number.

It is an amenable number.

6661751408 is an abundant number, since it is smaller than the sum of its proper divisors (7238249560).

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

6661751408 is a wasteful number, since it uses less digits than its factorization.

6661751408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32027672 (or 32027666 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 6661751408 is about 81619.5528534677. The cubic root of 6661751408 is about 1881.6094004898.

The spelling of 6661751408 in words is "six billion, six hundred sixty-one million, seven hundred fifty-one thousand, four hundred eight".