661423200634 has 12 divisors (see below), whose sum is σ = 1154115993114. Its totient is φ = 283467085944.

The previous prime is 661423200601. The next prime is 661423200637. The reversal of 661423200634 is 436002324166.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 469434633409 + 191988567225 = 685153^2 + 438165^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661423200593 and 661423200602.

It is not an unprimeable number, because it can be changed into a prime (661423200637) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3374608069 + ... + 3374608264.

Almost surely, 2^661423200634 is an apocalyptic number.

661423200634 is a deficient number, since it is larger than the sum of its proper divisors (492692792480).

661423200634 is a wasteful number, since it uses less digits than its factorization.

661423200634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6749216349 (or 6749216342 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

The spelling of 661423200634 in words is "six hundred sixty-one billion, four hundred twenty-three million, two hundred thousand, six hundred thirty-four".