2156077518 has 24 divisors (see below), whose sum is σ = 5016181032. Its totient is φ = 616022064.

The previous prime is 2156077481. The next prime is 2156077541. The reversal of 2156077518 is 8157706512.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156077518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3666505 + ... + 3667092.

It is an arithmetic number, because the mean of its divisors is an integer number (209007543).

Almost surely, 2^2156077518 is an apocalyptic number.

2156077518 is an abundant number, since it is smaller than the sum of its proper divisors (2860103514).

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

2156077518 is a wasteful number, since it uses less digits than its factorization.

2156077518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7333616 (or 7333609 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 42.

The square root of 2156077518 is about 46433.5817916301. The cubic root of 2156077518 is about 1291.8778647722.

The spelling of 2156077518 in words is "two billion, one hundred fifty-six million, seventy-seven thousand, five hundred eighteen".