7919061618 has 64 divisors (see below), whose sum is σ = 18140008320. Its totient is φ = 2283113472.

The previous prime is 7919061617. The next prime is 7919061643. The reversal of 7919061618 is 8161609197.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (7919061613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287848 + ... + 314156.

It is an arithmetic number, because the mean of its divisors is an integer number (283437630).

Almost surely, 2^7919061618 is an apocalyptic number.

7919061618 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7919061618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9070004160).

7919061618 is an abundant number, since it is smaller than the sum of its proper divisors (10220946702).

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

7919061618 is a wasteful number, since it uses less digits than its factorization.

7919061618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26571.

The product of its (nonzero) digits is 163296, while the sum is 48.

The square root of 7919061618 is about 88989.1095471800. The cubic root of 7919061618 is about 1993.2322595092.

The spelling of 7919061618 in words is "seven billion, nine hundred nineteen million, sixty-one thousand, six hundred eighteen".