6511473780 has 144 divisors (see below), whose sum is σ = 21284000640. Its totient is φ = 1483060992.

The previous prime is 6511473767. The next prime is 6511473781. The reversal of 6511473780 is 873741156.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6511473781) 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, 857641 + ... + 865199.

It is an arithmetic number, because the mean of its divisors is an integer number (147805560).

Almost surely, 2^6511473780 is an apocalyptic number.

6511473780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6511473780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10642000320).

6511473780 is an abundant number, since it is smaller than the sum of its proper divisors (14772526860).

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

6511473780 is a wasteful number, since it uses less digits than its factorization.

6511473780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878 (or 7869 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 6511473780 is about 80693.7034718323. The cubic root of 6511473780 is about 1867.3530357871.

The spelling of 6511473780 in words is "six billion, five hundred eleven million, four hundred seventy-three thousand, seven hundred eighty".