718510161997 has 4 divisors (see below), whose sum is σ = 718712164476. Its totient is φ = 718308159520.

The previous prime is 718510161989. The next prime is 718510162009. The reversal of 718510161997 is 799161015817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147618092521 + 570892069476 = 384211^2 + 755574^2 .

It is a cyclic number.

It is not a de Polignac number, because 718510161997 - 2³ = 718510161989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718510161197) 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, 100995904 + ... + 101003017.

It is an arithmetic number, because the mean of its divisors is an integer number (179678041119).

Almost surely, 2^718510161997 is an apocalyptic number.

It is an amenable number.

718510161997 is a deficient number, since it is larger than the sum of its proper divisors (202002479).

718510161997 is a wasteful number, since it uses less digits than its factorization.

718510161997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202002478.

The product of its (nonzero) digits is 952560, while the sum is 55.

The spelling of 718510161997 in words is "seven hundred eighteen billion, five hundred ten million, one hundred sixty-one thousand, nine hundred ninety-seven".