1618947863 has 4 divisors (see below), whose sum is σ = 1743482328. Its totient is φ = 1494413400.

The previous prime is 1618947833. The next prime is 1618947871. The reversal of 1618947863 is 3687498161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618947863 is a prime.

It is a super-2 number, since 2×1618947863² = 5241984366224533538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618947833) 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, 62267213 + ... + 62267238.

It is an arithmetic number, because the mean of its divisors is an integer number (435870582).

Almost surely, 2^1618947863 is an apocalyptic number.

1618947863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1618947863 is a deficient number, since it is larger than the sum of its proper divisors (124534465).

1618947863 is a wasteful number, since it uses less digits than its factorization.

1618947863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124534464.

The product of its digits is 1741824, while the sum is 53.

The square root of 1618947863 is about 40236.1511951628. The cubic root of 1618947863 is about 1174.2059794413.

The spelling of 1618947863 in words is "one billion, six hundred eighteen million, nine hundred forty-seven thousand, eight hundred sixty-three".