661006471 has 8 divisors (see below), whose sum is σ = 668995200. Its totient is φ = 653030400.

The previous prime is 661006457. The next prime is 661006537. The reversal of 661006471 is 174600166.

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

It is a cyclic number.

It is not a de Polignac number, because 661006471 - 2⁷ = 661006343 is a prime.

It is a super-3 number, since 3×661006471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661006421) 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, 140170 + ... + 144808.

It is an arithmetic number, because the mean of its divisors is an integer number (83624400).

Almost surely, 2^661006471 is an apocalyptic number.

661006471 is a deficient number, since it is larger than the sum of its proper divisors (7988729).

661006471 is a wasteful number, since it uses less digits than its factorization.

661006471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6329.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 661006471 is about 25710.0461104215. The cubic root of 661006471 is about 871.1011164623.

The spelling of 661006471 in words is "six hundred sixty-one million, six thousand, four hundred seventy-one".