6545531620 has 48 divisors (see below), whose sum is σ = 14160299328. Its totient is φ = 2539658880.

The previous prime is 6545531599. The next prime is 6545531627. The reversal of 6545531620 is 261355456.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 6545531620.

It is not an unprimeable number, because it can be changed into a prime (6545531627) 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, 231579 + ... + 258301.

It is an arithmetic number, because the mean of its divisors is an integer number (295006236).

Almost surely, 2^6545531620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6545531620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7080149664).

6545531620 is an abundant number, since it is smaller than the sum of its proper divisors (7614767708).

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

6545531620 is a wasteful number, since it uses less digits than its factorization.

6545531620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27100 (or 27098 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 6545531620 is about 80904.4598276263. The cubic root of 6545531620 is about 1870.6030655238.

The spelling of 6545531620 in words is "six billion, five hundred forty-five million, five hundred thirty-one thousand, six hundred twenty".