6506665550 has 48 divisors (see below), whose sum is σ = 15088712832. Its totient is φ = 2028050400.

The previous prime is 6506665541. The next prime is 6506665559. The reversal of 6506665550 is 555666056.

It is an interprime number because it is at equal distance from previous prime (6506665541) and next prime (6506665559).

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6506665559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 841172 + ... + 848871.

It is an arithmetic number, because the mean of its divisors is an integer number (314348184).

Almost surely, 2^6506665550 is an apocalyptic number.

6506665550 is an abundant number, since it is smaller than the sum of its proper divisors (8582047282).

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

6506665550 is a wasteful number, since it uses less digits than its factorization.

6506665550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690073 (or 1690068 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 44.

The square root of 6506665550 is about 80663.9048769646. The cubic root of 6506665550 is about 1866.8932896980.

The spelling of 6506665550 in words is "six billion, five hundred six million, six hundred sixty-five thousand, five hundred fifty".