2145111774640 has 40 divisors (see below), whose sum is σ = 4987599835680. Its totient is φ = 858007727616.

The previous prime is 2145111774607. The next prime is 2145111774647. The reversal of 2145111774640 is 464771115412.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (2145111774647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328956 + ... + 2460964.

It is an arithmetic number, because the mean of its divisors is an integer number (124689995892).

Almost surely, 2^{2145111774640} is an apocalyptic number.

2145111774640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2145111774640 is an abundant number, since it is smaller than the sum of its proper divisors (2842488061040).

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

2145111774640 is a wasteful number, since it uses less digits than its factorization.

2145111774640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155709 (or 1155703 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 2145111774640 in words is "two trillion, one hundred forty-five billion, one hundred eleven million, seven hundred seventy-four thousand, six hundred forty".