2157456366 has 72 divisors (see below), whose sum is σ = 5359601520. Its totient is φ = 624768768.

The previous prime is 2157456359. The next prime is 2157456397. The reversal of 2157456366 is 6636547512.

2157456366 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 4 + 5 + 636 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 30855 + ... + 72573.

It is an arithmetic number, because the mean of its divisors is an integer number (74438910).

Almost surely, 2^2157456366 is an apocalyptic number.

2157456366 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 2157456366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2679800760).

2157456366 is an abundant number, since it is smaller than the sum of its proper divisors (3202145154).

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

2157456366 is a wasteful number, since it uses less digits than its factorization.

2157456366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41770 (or 41754 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 2157456366 is about 46448.4269486061. The cubic root of 2157456366 is about 1292.1531986607.

It can be divided in two parts, 215745 and 6366, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 2157456366 in words is "two billion, one hundred fifty-seven million, four hundred fifty-six thousand, three hundred sixty-six".