66786761450 has 48 divisors (see below), whose sum is σ = 125713215000. Its totient is φ = 26394762240.

The previous prime is 66786761399. The next prime is 66786761453. The reversal of 66786761450 is 5416768766.

It can be written as a sum of positive squares in 12 ways, for example, as 67354849 + 66719406601 = 8207^2 + 258301^2 .

It is a super-2 number, since 2×66786761450² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66786761453) 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, 6888206 + ... + 6897894.

Almost surely, 2^66786761450 is an apocalyptic number.

66786761450 is a deficient number, since it is larger than the sum of its proper divisors (58926453550).

66786761450 is a wasteful number, since it uses less digits than its factorization.

66786761450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11339 (or 11334 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 56.

The spelling of 66786761450 in words is "sixty-six billion, seven hundred eighty-six million, seven hundred sixty-one thousand, four hundred fifty".