1618791779 has 4 divisors (see below), whose sum is σ = 1765954680. Its totient is φ = 1471628880.

The previous prime is 1618791767. The next prime is 1618791787. The reversal of 1618791779 is 9771978161.

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

It is a cyclic number.

It is not a de Polignac number, because 1618791779 - 2⁴ = 1618791763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618791739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73581434 + ... + 73581455.

It is an arithmetic number, because the mean of its divisors is an integer number (441488670).

Almost surely, 2^1618791779 is an apocalyptic number.

1618791779 is a deficient number, since it is larger than the sum of its proper divisors (147162901).

1618791779 is a wasteful number, since it uses less digits than its factorization.

1618791779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147162900.

The product of its digits is 1333584, while the sum is 56.

The square root of 1618791779 is about 40234.2115493767. The cubic root of 1618791779 is about 1174.1682428635.

It can be divided in two parts, 1618 and 791779, that added together give a palindrome (793397).

The spelling of 1618791779 in words is "one billion, six hundred eighteen million, seven hundred ninety-one thousand, seven hundred seventy-nine".