16640280497 has 8 divisors (see below), whose sum is σ = 16698634344. Its totient is φ = 16582019328.

The previous prime is 16640280473. The next prime is 16640280509. The reversal of 16640280497 is 79408204661.

It can be written as a sum of positive squares in 4 ways, for example, as 312481 + 16639968016 = 559^2 + 128996^2 .

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-16640280497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16640282497) 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, 346823 + ... + 391875.

It is an arithmetic number, because the mean of its divisors is an integer number (2087329293).

Almost surely, 2^16640280497 is an apocalyptic number.

It is an amenable number.

16640280497 is a deficient number, since it is larger than the sum of its proper divisors (58353847).

16640280497 is an equidigital number, since it uses as much as digits as its factorization.

16640280497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46339.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 16640280497 in words is "sixteen billion, six hundred forty million, two hundred eighty thousand, four hundred ninety-seven".