6660501261 has 8 divisors (see below), whose sum is σ = 8887141920. Its totient is φ = 4437097392.

The previous prime is 6660501229. The next prime is 6660501293. The reversal of 6660501261 is 1621050666.

It is an interprime number because it is at equal distance from previous prime (6660501229) and next prime (6660501293).

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

It is not a de Polignac number, because 6660501261 - 2⁵ = 6660501229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660501761) 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, 804391 + ... + 812628.

It is an arithmetic number, because the mean of its divisors is an integer number (1110892740).

Almost surely, 2^6660501261 is an apocalyptic number.

It is an amenable number.

6660501261 is a deficient number, since it is larger than the sum of its proper divisors (2226640659).

6660501261 is a wasteful number, since it uses less digits than its factorization.

6660501261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618395.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 6660501261 is about 81611.8941147674. The cubic root of 6660501261 is about 1881.4916919292.

The spelling of 6660501261 in words is "six billion, six hundred sixty million, five hundred one thousand, two hundred sixty-one".