6521854780 has 48 divisors (see below), whose sum is σ = 15660421056. Its totient is φ = 2234926080.

The previous prime is 6521854699. The next prime is 6521854783. The reversal of 6521854780 is 874581256.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6521854780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521854783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291762 + ... + 313318.

It is an arithmetic number, because the mean of its divisors is an integer number (326258772).

Almost surely, 2^6521854780 is an apocalyptic number.

It is an amenable number.

6521854780 is an abundant number, since it is smaller than the sum of its proper divisors (9138566276).

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

6521854780 is a wasteful number, since it uses less digits than its factorization.

6521854780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23734 (or 23732 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 46.

The square root of 6521854780 is about 80758.0013373288. The cubic root of 6521854780 is about 1868.3448593509.

The spelling of 6521854780 in words is "six billion, five hundred twenty-one million, eight hundred fifty-four thousand, seven hundred eighty".