4197921660 has 48 divisors (see below), whose sum is σ = 13060202400. Its totient is φ = 1119445632.

The previous prime is 4197921641. The next prime is 4197921661. The reversal of 4197921660 is 661297914.

4197921660 is a `hidden beast` number, since 419 + 79 + 2 + 166 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4197921661) 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, 3886425 + ... + 3887504.

It is an arithmetic number, because the mean of its divisors is an integer number (272087550).

Almost surely, 2^4197921660 is an apocalyptic number.

It is an amenable number.

4197921660 is an abundant number, since it is smaller than the sum of its proper divisors (8862280740).

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

4197921660 is a wasteful number, since it uses less digits than its factorization.

4197921660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7773947 (or 7773939 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 4197921660 is about 64791.3702587003. The cubic root of 4197921660 is about 1613.1624709011.

The spelling of 4197921660 in words is "four billion, one hundred ninety-seven million, nine hundred twenty-one thousand, six hundred sixty".