16523570989 has 32 divisors (see below), whose sum is σ = 18225561600. Its totient is φ = 14921470080.

The previous prime is 16523570953. The next prime is 16523571047. The reversal of 16523570989 is 98907532561.

It is a cyclic number.

It is not a de Polignac number, because 16523570989 - 2¹⁷ = 16523439917 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 (16523570909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20076832 + ... + 20077654.

It is an arithmetic number, because the mean of its divisors is an integer number (569548800).

Almost surely, 2^16523570989 is an apocalyptic number.

16523570989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16523570989 is a deficient number, since it is larger than the sum of its proper divisors (1701990611).

16523570989 is a wasteful number, since it uses less digits than its factorization.

16523570989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345.

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 16523570989 in words is "sixteen billion, five hundred twenty-three million, five hundred seventy thousand, nine hundred eighty-nine".