19967135497 has 8 divisors (see below), whose sum is σ = 20108204640. Its totient is φ = 19826394720.

The previous prime is 19967135483. The next prime is 19967135509. The reversal of 19967135497 is 79453176991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19967135497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19967135437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40597 + ... + 203917.

It is an arithmetic number, because the mean of its divisors is an integer number (2513525580).

Almost surely, 2^19967135497 is an apocalyptic number.

It is an amenable number.

19967135497 is a deficient number, since it is larger than the sum of its proper divisors (141069143).

19967135497 is a wasteful number, since it uses less digits than its factorization.

19967135497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164183.

The product of its digits is 12859560, while the sum is 61.

The spelling of 19967135497 in words is "nineteen billion, nine hundred sixty-seven million, one hundred thirty-five thousand, four hundred ninety-seven".