6511285640 has 16 divisors (see below), whose sum is σ = 14650392780. Its totient is φ = 2604514240.

The previous prime is 6511285637. The next prime is 6511285643. The reversal of 6511285640 is 465821156.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6511285637) and next prime (6511285643).

It can be written as a sum of positive squares in 2 ways, for example, as 6146246404 + 365039236 = 78398^2 + 19106^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6511285594 and 6511285603.

It is not an unprimeable number, because it can be changed into a prime (6511285643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81391031 + ... + 81391110.

Almost surely, 2^6511285640 is an apocalyptic number.

It is an amenable number.

6511285640 is an abundant number, since it is smaller than the sum of its proper divisors (8139107140).

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

6511285640 is a wasteful number, since it uses less digits than its factorization.

6511285640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162782152 (or 162782148 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 6511285640 is about 80692.5376971130. The cubic root of 6511285640 is about 1867.3350507556.

The spelling of 6511285640 in words is "six billion, five hundred eleven million, two hundred eighty-five thousand, six hundred forty".