2171907451764 has 48 divisors (see below), whose sum is σ = 5700388122240. Its totient is φ = 723969147672.

The previous prime is 2171907451759. The next prime is 2171907451783. The reversal of 2171907451764 is 4671547091712.

2171907451764 is a `hidden beast` number, since 217 + 190 + 74 + 5 + 176 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 2171907451764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124128624 + ... + 124146119.

It is an arithmetic number, because the mean of its divisors is an integer number (118758085880).

Almost surely, 2^{2171907451764} is an apocalyptic number.

It is an amenable number.

2171907451764 is an abundant number, since it is smaller than the sum of its proper divisors (3528480670476).

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

2171907451764 is an equidigital number, since it uses as much as digits as its factorization.

2171907451764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248274768 (or 248274748 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 2171907451764 in words is "two trillion, one hundred seventy-one billion, nine hundred seven million, four hundred fifty-one thousand, seven hundred sixty-four".