2661887798 has 4 divisors (see below), whose sum is σ = 3992831700. Its totient is φ = 1330943898.

The previous prime is 2661887797. The next prime is 2661887807. The reversal of 2661887798 is 8977881662.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2661887798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661887791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665471948 + ... + 665471951.

It is an arithmetic number, because the mean of its divisors is an integer number (998207925).

Almost surely, 2^2661887798 is an apocalyptic number.

2661887798 is a deficient number, since it is larger than the sum of its proper divisors (1330943902).

2661887798 is a wasteful number, since it uses less digits than its factorization.

2661887798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330943901.

The product of its digits is 16257024, while the sum is 62.

The square root of 2661887798 is about 51593.4860035644. The cubic root of 2661887798 is about 1385.8936827566.

The spelling of 2661887798 in words is "two billion, six hundred sixty-one million, eight hundred eighty-seven thousand, seven hundred ninety-eight".