16860497551 has 4 divisors (see below), whose sum is σ = 17316186712. Its totient is φ = 16404808392.

The previous prime is 16860497531. The next prime is 16860497561. The reversal of 16860497551 is 15579406861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15579406861 = 26861 ⋅580001.

It is a cyclic number.

It is not a de Polignac number, because 16860497551 - 2¹¹ = 16860495503 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 (16860497531) 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, 227844525 + ... + 227844598.

It is an arithmetic number, because the mean of its divisors is an integer number (4329046678).

Almost surely, 2^16860497551 is an apocalyptic number.

16860497551 is a deficient number, since it is larger than the sum of its proper divisors (455689161).

16860497551 is an equidigital number, since it uses as much as digits as its factorization.

16860497551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455689160.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 16860497551 in words is "sixteen billion, eight hundred sixty million, four hundred ninety-seven thousand, five hundred fifty-one".