1618643528650 has 24 divisors (see below), whose sum is σ = 3010856400000. Its totient is φ = 647418822960.

The previous prime is 1618643528647. The next prime is 1618643528659. The reversal of 1618643528650 is 568253468161.

It is a super-5 number, since 5×1618643528650⁵ (a number of 62 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1618643528591 and 1618643528600.

It is not an unprimeable number, because it can be changed into a prime (1618643528659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109900 + ... + 1802599.

It is an arithmetic number, because the mean of its divisors is an integer number (125452350000).

Almost surely, 2^{1618643528650} is an apocalyptic number.

1618643528650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1618643528650 is a deficient number, since it is larger than the sum of its proper divisors (1392212871350).

1618643528650 is a wasteful number, since it uses less digits than its factorization.

1618643528650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929438 (or 1929433 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 1618643528650 in words is "one trillion, six hundred eighteen billion, six hundred forty-three million, five hundred twenty-eight thousand, six hundred fifty".