66490599735 has 128 divisors (see below), whose sum is σ = 138080256000. Its totient is φ = 30344751360.

The previous prime is 66490599689. The next prime is 66490599739. The reversal of 66490599735 is 53799509466.

66490599735 is a `hidden beast` number, since 6 + 6 + 4 + 9 + 0 + 599 + 7 + 35 = 666.

It is not a de Polignac number, because 66490599735 - 2²² = 66486405431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66490599739) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 50332875 + ... + 50334195.

It is an arithmetic number, because the mean of its divisors is an integer number (1078752000).

Almost surely, 2^66490599735 is an apocalyptic number.

66490599735 is an abundant number, since it is smaller than the sum of its proper divisors (71589656265).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66490599735 is a wasteful number, since it uses less digits than its factorization.

66490599735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 55112400, while the sum is 63.

The spelling of 66490599735 in words is "sixty-six billion, four hundred ninety million, five hundred ninety-nine thousand, seven hundred thirty-five".