19947910668 has 48 divisors (see below), whose sum is σ = 53291798784. Its totient is φ = 5688970560.

The previous prime is 19947910663. The next prime is 19947910673. The reversal of 19947910668 is 86601974991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19947910663) and next prime (19947910673).

It is not an unprimeable number, because it can be changed into a prime (19947910663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171123 + ... + 263018.

It is an arithmetic number, because the mean of its divisors is an integer number (1110245808).

Almost surely, 2^19947910668 is an apocalyptic number.

It is an amenable number.

19947910668 is an abundant number, since it is smaller than the sum of its proper divisors (33343888116).

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

19947910668 is a wasteful number, since it uses less digits than its factorization.

19947910668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434702 (or 434700 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 60.

The spelling of 19947910668 in words is "nineteen billion, nine hundred forty-seven million, nine hundred ten thousand, six hundred sixty-eight".