6501661345 has 8 divisors (see below), whose sum is σ = 7911881280. Its totient is φ = 5128070640.

The previous prime is 6501661343. The next prime is 6501661417. The reversal of 6501661345 is 5431661056.

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

It is not a de Polignac number, because 6501661345 - 2¹ = 6501661343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6501661343) 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, 9156915 + ... + 9157624.

It is an arithmetic number, because the mean of its divisors is an integer number (988985160).

Almost surely, 2^6501661345 is an apocalyptic number.

It is an amenable number.

6501661345 is a deficient number, since it is larger than the sum of its proper divisors (1410219935).

6501661345 is a wasteful number, since it uses less digits than its factorization.

6501661345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18314615.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 6501661345 is about 80632.8800490222. The cubic root of 6501661345 is about 1866.4145645757.

It can be divided in two parts, 650166 and 1345, that added together give a triangular number (651511 = T₁₁₄₁).

The spelling of 6501661345 in words is "six billion, five hundred one million, six hundred sixty-one thousand, three hundred forty-five".