3666525420 has 72 divisors (see below), whose sum is σ = 10422551664. Its totient is φ = 963076224.

The previous prime is 3666525391. The next prime is 3666525431. The reversal of 3666525420 is 245256663.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262534 + ... + 276146.

It is an arithmetic number, because the mean of its divisors is an integer number (144757662).

Almost surely, 2^3666525420 is an apocalyptic number.

3666525420 is a gapful number since it is divisible by the number (30) 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 3666525420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5211275832).

3666525420 is an abundant number, since it is smaller than the sum of its proper divisors (6756026244).

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

3666525420 is a wasteful number, since it uses less digits than its factorization.

3666525420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13759 (or 13690 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 3666525420 is about 60551.8407647530. The cubic root of 3666525420 is about 1542.0018689805.

The spelling of 3666525420 in words is "three billion, six hundred sixty-six million, five hundred twenty-five thousand, four hundred twenty".