19980949475 has 6 divisors (see below), whose sum is σ = 24776377380. Its totient is φ = 15984759560.

The previous prime is 19980949451. The next prime is 19980949477. The reversal of 19980949475 is 57494908991.

It is not a de Polignac number, because 19980949475 - 2¹⁰ = 19980948451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19980949477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399618965 + ... + 399619014.

It is an arithmetic number, because the mean of its divisors is an integer number (4129396230).

Almost surely, 2^19980949475 is an apocalyptic number.

19980949475 is a deficient number, since it is larger than the sum of its proper divisors (4795427905).

19980949475 is an equidigital number, since it uses as much as digits as its factorization.

19980949475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799237989 (or 799237984 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 65.

The spelling of 19980949475 in words is "nineteen billion, nine hundred eighty million, nine hundred forty-nine thousand, four hundred seventy-five".