2157461766 has 48 divisors (see below), whose sum is σ = 4725813456. Its totient is φ = 711287808.

The previous prime is 2157461759. The next prime is 2157461767. The reversal of 2157461766 is 6671647512.

2157461766 is a `hidden beast` number, since 2 + 1 + 574 + 6 + 1 + 76 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157461767) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1388446 + ... + 1389998.

It is an arithmetic number, because the mean of its divisors is an integer number (98454447).

Almost surely, 2^2157461766 is an apocalyptic number.

2157461766 is an abundant number, since it is smaller than the sum of its proper divisors (2568351690).

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

2157461766 is a wasteful number, since it uses less digits than its factorization.

2157461766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357 (or 2354 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 2157461766 is about 46448.4850775566. The cubic root of 2157461766 is about 1292.1542767236.

The spelling of 2157461766 in words is "two billion, one hundred fifty-seven million, four hundred sixty-one thousand, seven hundred sixty-six".