66761554965 has 64 divisors (see below), whose sum is σ = 126578073600. Its totient is φ = 29399457024.

The previous prime is 66761554933. The next prime is 66761554997. The reversal of 66761554965 is 56945516766.

It is an interprime number because it is at equal distance from previous prime (66761554933) and next prime (66761554997).

It is not a de Polignac number, because 66761554965 - 2⁵ = 66761554933 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66761554899 and 66761554908.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1311784 + ... + 1361726.

It is an arithmetic number, because the mean of its divisors is an integer number (1977782400).

Almost surely, 2^66761554965 is an apocalyptic number.

It is an amenable number.

66761554965 is a deficient number, since it is larger than the sum of its proper divisors (59816518635).

66761554965 is a wasteful number, since it uses less digits than its factorization.

66761554965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50426.

The product of its digits is 40824000, while the sum is 60.

The spelling of 66761554965 in words is "sixty-six billion, seven hundred sixty-one million, five hundred fifty-four thousand, nine hundred sixty-five".