2161954450488 has 32 divisors (see below), whose sum is σ = 6177012716160. Its totient is φ = 617701271520.

The previous prime is 2161954450463. The next prime is 2161954450499. The reversal of 2161954450488 is 8840544591612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6434388078 + ... + 6434388413.

It is an arithmetic number, because the mean of its divisors is an integer number (193031647380).

Almost surely, 2^{2161954450488} is an apocalyptic number.

2161954450488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2161954450488 is an abundant number, since it is smaller than the sum of its proper divisors (4015058265672).

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

2161954450488 is a wasteful number, since it uses less digits than its factorization.

2161954450488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12868776507 (or 12868776503 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 57.

The spelling of 2161954450488 in words is "two trillion, one hundred sixty-one billion, nine hundred fifty-four million, four hundred fifty thousand, four hundred eighty-eight".