16425564985 has 24 divisors (see below), whose sum is σ = 21613821696. Its totient is φ = 11968500480.

The previous prime is 16425564979. The next prime is 16425564989. The reversal of 16425564985 is 58946552461.

It is a happy number.

It is not a de Polignac number, because 16425564985 - 2¹³ = 16425556793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16425564989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138547 + ... + 228136.

It is an arithmetic number, because the mean of its divisors is an integer number (900575904).

Almost surely, 2^16425564985 is an apocalyptic number.

It is an amenable number.

16425564985 is a deficient number, since it is larger than the sum of its proper divisors (5188256711).

16425564985 is a wasteful number, since it uses less digits than its factorization.

16425564985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366753 (or 366736 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 55.

The spelling of 16425564985 in words is "sixteen billion, four hundred twenty-five million, five hundred sixty-four thousand, nine hundred eighty-five".