6642478500 has 192 divisors, whose sum is σ = 22820388864. Its totient is φ = 1469232000.

The previous prime is 6642478487. The next prime is 6642478517. The reversal of 6642478500 is 58742466.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 315297 + ... + 335703.

It is an arithmetic number, because the mean of its divisors is an integer number (118856192).

Almost surely, 2^6642478500 is an apocalyptic number.

6642478500 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 6642478500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11410194432).

6642478500 is an abundant number, since it is smaller than the sum of its proper divisors (16177910364).

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

6642478500 is a wasteful number, since it uses less digits than its factorization.

6642478500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20467 (or 20455 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 6642478500 is about 81501.4018284348. The cubic root of 6642478500 is about 1879.7931057216.

The spelling of 6642478500 in words is "six billion, six hundred forty-two million, four hundred seventy-eight thousand, five hundred".