16478551 has 2 divisors, whose sum is σ = 16478552. Its totient is φ = 16478550.

The previous prime is 16478549. The next prime is 16478569. The reversal of 16478551 is 15587461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16478551 - 2¹ = 16478549 is a prime.

Together with 16478549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16478551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16478591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8239275 + 8239276.

It is an arithmetic number, because the mean of its divisors is an integer number (8239276).

Almost surely, 2^16478551 is an apocalyptic number.

16478551 is a deficient number, since it is larger than the sum of its proper divisors (1).

16478551 is an equidigital number, since it uses as much as digits as its factorization.

16478551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 16478551 is about 4059.3781543483. The cubic root of 16478551 is about 254.4718068514.

It can be divided in two parts, 164785 and 51, that added together give a square (164836 = 406²).

The spelling of 16478551 in words is "sixteen million, four hundred seventy-eight thousand, five hundred fifty-one".