16506423551 has 16 divisors (see below), whose sum is σ = 17160897600. Its totient is φ = 15857856000.

The previous prime is 16506423541. The next prime is 16506423589. The reversal of 16506423551 is 15532460561.

It is a cyclic number.

It is not a de Polignac number, because 16506423551 - 2⁶ = 16506423487 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 (16506423511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5359430 + ... + 5362508.

It is an arithmetic number, because the mean of its divisors is an integer number (1072556100).

Almost surely, 2^16506423551 is an apocalyptic number.

16506423551 is a deficient number, since it is larger than the sum of its proper divisors (654474049).

16506423551 is a wasteful number, since it uses less digits than its factorization.

16506423551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 16506423551 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, five hundred fifty-one".