661045623367 has 4 divisors (see below), whose sum is σ = 661155273720. Its totient is φ = 660935973016.

The previous prime is 661045623361. The next prime is 661045623379. The reversal of 661045623367 is 763326540166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661045623367 - 2⁷ = 661045623239 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661045623367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661045623361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54816133 + ... + 54828190.

It is an arithmetic number, because the mean of its divisors is an integer number (165288818430).

Almost surely, 2^661045623367 is an apocalyptic number.

661045623367 is a deficient number, since it is larger than the sum of its proper divisors (109650353).

661045623367 is a wasteful number, since it uses less digits than its factorization.

661045623367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109650352.

The product of its (nonzero) digits is 3265920, while the sum is 49.

The spelling of 661045623367 in words is "six hundred sixty-one billion, forty-five million, six hundred twenty-three thousand, three hundred sixty-seven".