6469631918 has 4 divisors (see below), whose sum is σ = 9704447880. Its totient is φ = 3234815958.

The previous prime is 6469631891. The next prime is 6469631923. The reversal of 6469631918 is 8191369646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8191369646 = 2 ⋅4095684823.

It is a super-2 number, since 2×6469631918² = 83712274308808717448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6469631918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1617407978 + ... + 1617407981.

It is an arithmetic number, because the mean of its divisors is an integer number (2426111970).

Almost surely, 2^6469631918 is an apocalyptic number.

6469631918 is a deficient number, since it is larger than the sum of its proper divisors (3234815962).

6469631918 is a wasteful number, since it uses less digits than its factorization.

6469631918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234815961.

The product of its digits is 1679616, while the sum is 53.

The square root of 6469631918 is about 80434.0221423746. The cubic root of 6469631918 is about 1863.3446505251.

The spelling of 6469631918 in words is "six billion, four hundred sixty-nine million, six hundred thirty-one thousand, nine hundred eighteen".