66510013400 has 48 divisors (see below), whose sum is σ = 154945905000. Its totient is φ = 26550650880.

The previous prime is 66510013397. The next prime is 66510013433. The reversal of 66510013400 is 431001566.

It is a self number, because there is not a number n which added to its sum of digits gives 66510013400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233417 + ... + 433016.

Almost surely, 2^66510013400 is an apocalyptic number.

It is an amenable number.

66510013400 is an abundant number, since it is smaller than the sum of its proper divisors (88435891600).

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

66510013400 is a wasteful number, since it uses less digits than its factorization.

66510013400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666948 (or 666939 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 66510013400 its reverse (431001566), we get a palindrome (66941014966).

The spelling of 66510013400 in words is "sixty-six billion, five hundred ten million, thirteen thousand, four hundred".