35661780661 has 16 divisors (see below), whose sum is σ = 39029364864. Its totient is φ = 32384683584.

The previous prime is 35661780653. The next prime is 35661780709. The reversal of 35661780661 is 16608716653.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 35661780661 - 2³ = 35661780653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35661780601) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 646800 + ... + 699766.

It is an arithmetic number, because the mean of its divisors is an integer number (2439335304).

Almost surely, 2^35661780661 is an apocalyptic number.

It is an amenable number.

35661780661 is a deficient number, since it is larger than the sum of its proper divisors (3367584203).

35661780661 is a wasteful number, since it uses less digits than its factorization.

35661780661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53820.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 35661780661 in words is "thirty-five billion, six hundred sixty-one million, seven hundred eighty thousand, six hundred sixty-one".