16506423390 has 16 divisors (see below), whose sum is σ = 39615416208. Its totient is φ = 4401712896.

The previous prime is 16506423389. The next prime is 16506423391. The reversal of 16506423390 is 9332460561.

It is an interprime number because it is at equal distance from previous prime (16506423389) and next prime (16506423391).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506423391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275107027 + ... + 275107086.

It is an arithmetic number, because the mean of its divisors is an integer number (2475963513).

Almost surely, 2^16506423390 is an apocalyptic number.

16506423390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16506423390 is an abundant number, since it is smaller than the sum of its proper divisors (23108992818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16506423390 is a wasteful number, since it uses less digits than its factorization.

16506423390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550214123.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 16506423390 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, three hundred ninety".