16251555455 has 4 divisors (see below), whose sum is σ = 19501866552. Its totient is φ = 13001244360.

The previous prime is 16251555421. The next prime is 16251555457. The reversal of 16251555455 is 55455515261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55455515261 = 17 ⋅3262089133.

It is not a de Polignac number, because 16251555455 - 2⁶ = 16251555391 is a prime.

It is a super-2 number, since 2×16251555455² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16251555457) 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, 1625155541 + ... + 1625155550.

It is an arithmetic number, because the mean of its divisors is an integer number (4875466638).

Almost surely, 2^16251555455 is an apocalyptic number.

16251555455 is a deficient number, since it is larger than the sum of its proper divisors (3250311097).

16251555455 is an equidigital number, since it uses as much as digits as its factorization.

16251555455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250311096.

The product of its digits is 750000, while the sum is 44.

The spelling of 16251555455 in words is "sixteen billion, two hundred fifty-one million, five hundred fifty-five thousand, four hundred fifty-five".