4001621660 has 12 divisors (see below), whose sum is σ = 8403405528. Its totient is φ = 1600648656.

The previous prime is 4001621651. The next prime is 4001621671. The reversal of 4001621660 is 661261004.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100040522 + ... + 100040561.

It is an arithmetic number, because the mean of its divisors is an integer number (700283794).

Almost surely, 2^4001621660 is an apocalyptic number.

It is an amenable number.

4001621660 is an abundant number, since it is smaller than the sum of its proper divisors (4401783868).

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

4001621660 is a wasteful number, since it uses less digits than its factorization.

4001621660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200081092 (or 200081090 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 4001621660 is about 63258.3722522165. The cubic root of 4001621660 is about 1587.6155417175.

Adding to 4001621660 its reverse (661261004), we get a palindrome (4662882664).

The spelling of 4001621660 in words is "four billion, one million, six hundred twenty-one thousand, six hundred sixty".