19625621650 has 24 divisors (see below), whose sum is σ = 36547766820. Its totient is φ = 7840762560.

The previous prime is 19625621633. The next prime is 19625621657. The reversal of 19625621650 is 5612652691.

It can be written as a sum of positive squares in 6 ways, for example, as 1760893369 + 17864728281 = 41963^2 + 133659^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19625621597 and 19625621606.

It is not an unprimeable number, because it can be changed into a prime (19625621657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195289 + ... + 278188.

Almost surely, 2^19625621650 is an apocalyptic number.

19625621650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19625621650 is a deficient number, since it is larger than the sum of its proper divisors (16922145170).

19625621650 is a wasteful number, since it uses less digits than its factorization.

19625621650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474318 (or 474313 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 19625621650 in words is "nineteen billion, six hundred twenty-five million, six hundred twenty-one thousand, six hundred fifty".