2161056465040 has 80 divisors (see below), whose sum is σ = 5547264077376. Its totient is φ = 776370752000.

The previous prime is 2161056465037. The next prime is 2161056465097. The reversal of 2161056465040 is 405646501612.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2161056464984 and 2161056465002.

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, 14720611 + ... + 14866690.

Almost surely, 2^{2161056465040} is an apocalyptic number.

2161056465040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161056465040 is an abundant number, since it is smaller than the sum of its proper divisors (3386207612336).

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

2161056465040 is a wasteful number, since it uses less digits than its factorization.

2161056465040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29587408 (or 29587402 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 2161056465040 in words is "two trillion, one hundred sixty-one billion, fifty-six million, four hundred sixty-five thousand, forty".