1618461778 has 16 divisors (see below), whose sum is σ = 2630279520. Its totient is φ = 743916096.

The previous prime is 1618461773. The next prime is 1618461791. The reversal of 1618461778 is 8771648161.

It is not an unprimeable number, because it can be changed into a prime (1618461773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552048 + ... + 554971.

It is an arithmetic number, because the mean of its divisors is an integer number (164392470).

Almost surely, 2^1618461778 is an apocalyptic number.

1618461778 is a deficient number, since it is larger than the sum of its proper divisors (1011817742).

1618461778 is a wasteful number, since it uses less digits than its factorization.

1618461778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107081.

The product of its digits is 451584, while the sum is 49.

The square root of 1618461778 is about 40230.1103403906. The cubic root of 1618461778 is about 1174.0884502197.

The spelling of 1618461778 in words is "one billion, six hundred eighteen million, four hundred sixty-one thousand, seven hundred seventy-eight".