19667948397 has 32 divisors (see below), whose sum is σ = 27915552000. Its totient is φ = 12274633728.

The previous prime is 19667948387. The next prime is 19667948411. The reversal of 19667948397 is 79384976691.

It is not a de Polignac number, because 19667948397 - 2⁷ = 19667948269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19667948387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8666979 + ... + 8669247.

It is an arithmetic number, because the mean of its divisors is an integer number (872361000).

Almost surely, 2^19667948397 is an apocalyptic number.

19667948397 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19667948397 is a deficient number, since it is larger than the sum of its proper divisors (8247603603).

19667948397 is a wasteful number, since it uses less digits than its factorization.

19667948397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125.

The product of its digits is 123451776, while the sum is 69.

The spelling of 19667948397 in words is "nineteen billion, six hundred sixty-seven million, nine hundred forty-eight thousand, three hundred ninety-seven".