661213096863 has 8 divisors (see below), whose sum is σ = 961764504576. Its totient is φ = 400735210200.

The previous prime is 661213096813. The next prime is 661213096883. The reversal of 661213096863 is 368690312166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661213096863 - 2¹⁶ = 661213031327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661213096813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10018380223 + ... + 10018380288.

It is an arithmetic number, because the mean of its divisors is an integer number (120220563072).

Almost surely, 2^661213096863 is an apocalyptic number.

661213096863 is a deficient number, since it is larger than the sum of its proper divisors (300551407713).

661213096863 is a wasteful number, since it uses less digits than its factorization.

661213096863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20036760525.

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 661213096863 in words is "six hundred sixty-one billion, two hundred thirteen million, ninety-six thousand, eight hundred sixty-three".