2660381858 has 4 divisors (see below), whose sum is σ = 3990572790. Its totient is φ = 1330190928.

The previous prime is 2660381827. The next prime is 2660381861. The reversal of 2660381858 is 8581830662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1397787769 + 1262594089 = 37387^2 + 35533^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665095463 + ... + 665095466.

Almost surely, 2^2660381858 is an apocalyptic number.

2660381858 is a deficient number, since it is larger than the sum of its proper divisors (1330190932).

2660381858 is a wasteful number, since it uses less digits than its factorization.

2660381858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330190931.

The product of its (nonzero) digits is 552960, while the sum is 47.

The square root of 2660381858 is about 51578.8896545864. The cubic root of 2660381858 is about 1385.6322810001.

The spelling of 2660381858 in words is "two billion, six hundred sixty million, three hundred eighty-one thousand, eight hundred fifty-eight".