17910161997 has 64 divisors (see below), whose sum is σ = 32193262080. Its totient is φ = 8584740864.

The previous prime is 17910161989. The next prime is 17910162007. The reversal of 17910161997 is 79916101971.

It is not a de Polignac number, because 17910161997 - 2³ = 17910161989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17910161917) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68053 + ... + 201125.

It is an arithmetic number, because the mean of its divisors is an integer number (503019720).

Almost surely, 2^17910161997 is an apocalyptic number.

17910161997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

17910161997 is a deficient number, since it is larger than the sum of its proper divisors (14283100083).

17910161997 is a wasteful number, since it uses less digits than its factorization.

17910161997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133142.

The product of its (nonzero) digits is 214326, while the sum is 51.

The spelling of 17910161997 in words is "seventeen billion, nine hundred ten million, one hundred sixty-one thousand, nine hundred ninety-seven".