2016422661561 has 24 divisors (see below), whose sum is σ = 3411832038624. Its totient is φ = 1047492290880.

The previous prime is 2016422661559. The next prime is 2016422661571. The reversal of 2016422661561 is 1651662246102.

It is not a de Polignac number, because 2016422661561 - 2¹ = 2016422661559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2016422661571) 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, 623505700 + ... + 623508933.

It is an arithmetic number, because the mean of its divisors is an integer number (142159668276).

Almost surely, 2^{2016422661561} is an apocalyptic number.

2016422661561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2016422661561 is a deficient number, since it is larger than the sum of its proper divisors (1395409377063).

2016422661561 is a wasteful number, since it uses less digits than its factorization.

2016422661561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247014661 (or 1247014654 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 2016422661561 in words is "two trillion, sixteen billion, four hundred twenty-two million, six hundred sixty-one thousand, five hundred sixty-one".