66430777554 has 12 divisors (see below), whose sum is σ = 143933351406. Its totient is φ = 22143592512.

The previous prime is 66430777507. The next prime is 66430777631. The reversal of 66430777554 is 45577703466.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57953340225 + 8477437329 = 240735^2 + 92073^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66430777554.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1845299359 + ... + 1845299394.

Almost surely, 2^66430777554 is an apocalyptic number.

66430777554 is an abundant number, since it is smaller than the sum of its proper divisors (77502573852).

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

66430777554 is a wasteful number, since it uses less digits than its factorization.

66430777554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3690598761 (or 3690598758 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 54.

The spelling of 66430777554 in words is "sixty-six billion, four hundred thirty million, seven hundred seventy-seven thousand, five hundred fifty-four".