19886499970 has 8 divisors (see below), whose sum is σ = 35795699964. Its totient is φ = 7954599984.

The previous prime is 19886499961. The next prime is 19886499973. The reversal of 19886499970 is 7999468891.

It can be written as a sum of positive squares in 2 ways, for example, as 19570051449 + 316448521 = 139893^2 + 17789^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19886499970.

It is not an unprimeable number, because it can be changed into a prime (19886499973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994324989 + ... + 994325008.

Almost surely, 2^19886499970 is an apocalyptic number.

19886499970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19886499970 is a deficient number, since it is larger than the sum of its proper divisors (15909199994).

19886499970 is a wasteful number, since it uses less digits than its factorization.

19886499970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988650004.

The product of its (nonzero) digits is 70543872, while the sum is 70.

The spelling of 19886499970 in words is "nineteen billion, eight hundred eighty-six million, four hundred ninety-nine thousand, nine hundred seventy".