16662071767261 has 4 divisors (see below), whose sum is σ = 16666060775932. Its totient is φ = 16658082758592.

The previous prime is 16662071767247. The next prime is 16662071767301. The reversal of 16662071767261 is 16276717026661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13476314420100 + 3185757347161 = 3671010^2 + 1784869^2 .

It is a cyclic number.

It is not a de Polignac number, because 16662071767261 - 2²¹ = 16662069670109 is a prime.

It is a super-2 number, since 2×16662071767261² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16662071767196 and 16662071767205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16662071747261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994498070 + ... + 1994506423.

It is an arithmetic number, because the mean of its divisors is an integer number (4166515193983).

Almost surely, 2^{16662071767261} is an apocalyptic number.

It is an amenable number.

16662071767261 is a deficient number, since it is larger than the sum of its proper divisors (3989008671).

16662071767261 is an equidigital number, since it uses as much as digits as its factorization.

16662071767261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989008670.

The product of its (nonzero) digits is 10668672, while the sum is 58.

The spelling of 16662071767261 in words is "sixteen trillion, six hundred sixty-two billion, seventy-one million, seven hundred sixty-seven thousand, two hundred sixty-one".