19997087177 has 16 divisors (see below), whose sum is σ = 20565600000. Its totient is φ = 19433557584.

The previous prime is 19997087171. The next prime is 19997087183. The reversal of 19997087177 is 77178079991.

It is an interprime number because it is at equal distance from previous prime (19997087171) and next prime (19997087183).

It is a cyclic number.

It is not a de Polignac number, because 19997087177 - 2⁶ = 19997087113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19997087171) 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, 8130974 + ... + 8133432.

It is an arithmetic number, because the mean of its divisors is an integer number (1285350000).

Almost surely, 2^19997087177 is an apocalyptic number.

It is an amenable number.

19997087177 is a deficient number, since it is larger than the sum of its proper divisors (568512823).

19997087177 is a wasteful number, since it uses less digits than its factorization.

19997087177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3380.

The product of its (nonzero) digits is 14002632, while the sum is 65.

The spelling of 19997087177 in words is "nineteen billion, nine hundred ninety-seven million, eighty-seven thousand, one hundred seventy-seven".