6641650545 has 48 divisors (see below), whose sum is σ = 11693693760. Its totient is φ = 3209804928.

The previous prime is 6641650541. The next prime is 6641650549. The reversal of 6641650545 is 5450561466.

It is an interprime number because it is at equal distance from previous prime (6641650541) and next prime (6641650549).

It is not a de Polignac number, because 6641650545 - 2² = 6641650541 is a prime.

It is a super-2 number, since 2×6641650545² = 88223043923797594050, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6641650497 and 6641650506.

It is not an unprimeable number, because it can be changed into a prime (6641650541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 128739 + ... + 172791.

It is an arithmetic number, because the mean of its divisors is an integer number (243618620).

Almost surely, 2^6641650545 is an apocalyptic number.

It is an amenable number.

6641650545 is a deficient number, since it is larger than the sum of its proper divisors (5052043215).

6641650545 is a wasteful number, since it uses less digits than its factorization.

6641650545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44126 (or 44103 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The square root of 6641650545 is about 81496.3222789839. The cubic root of 6641650545 is about 1879.7149998976.

The spelling of 6641650545 in words is "six billion, six hundred forty-one million, six hundred fifty thousand, five hundred forty-five".