16425653661 has 8 divisors (see below), whose sum is σ = 24334301760. Its totient is φ = 10950435756.

The previous prime is 16425653641. The next prime is 16425653663. The reversal of 16425653661 is 16635652461.

16425653661 is a `hidden beast` number, since 1 + 6 + 4 + 2 + 56 + 536 + 61 = 666.

It is not a de Polignac number, because 16425653661 - 2⁶ = 16425653597 is a prime.

It is a super-2 number, since 2×16425653661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16425653663) 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, 304178745 + ... + 304178798.

It is an arithmetic number, because the mean of its divisors is an integer number (3041787720).

Almost surely, 2^16425653661 is an apocalyptic number.

It is an amenable number.

16425653661 is a deficient number, since it is larger than the sum of its proper divisors (7908648099).

16425653661 is an equidigital number, since it uses as much as digits as its factorization.

16425653661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608357552 (or 608357546 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 16425653661 in words is "sixteen billion, four hundred twenty-five million, six hundred fifty-three thousand, six hundred sixty-one".