66761619337869 has 16 divisors (see below), whose sum is σ = 89051703321024. Its totient is φ = 44489642163200.

The previous prime is 66761619337841. The next prime is 66761619337901. The reversal of 66761619337869 is 96873391616766.

It is a cyclic number.

It is not a de Polignac number, because 66761619337869 - 2¹¹ = 66761619335821 is a prime.

It is a super-2 number, since 2×66761619337869² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66761619337794 and 66761619337803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761619327869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211938454 + ... + 212253224.

It is an arithmetic number, because the mean of its divisors is an integer number (5565731457564).

Almost surely, 2^{66761619337869} is an apocalyptic number.

It is an amenable number.

66761619337869 is a deficient number, since it is larger than the sum of its proper divisors (22290083983155).

66761619337869 is a wasteful number, since it uses less digits than its factorization.

66761619337869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343308.

The product of its digits is 2222131968, while the sum is 78.

The spelling of 66761619337869 in words is "sixty-six trillion, seven hundred sixty-one billion, six hundred nineteen million, three hundred thirty-seven thousand, eight hundred sixty-nine".