661628362767 has 4 divisors (see below), whose sum is σ = 882171150360. Its totient is φ = 441085575176.

The previous prime is 661628362751. The next prime is 661628362777. The reversal of 661628362767 is 767263826166.

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 661628362767 - 2⁴ = 661628362751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661628362767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661628362777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110271393792 + ... + 110271393797.

It is an arithmetic number, because the mean of its divisors is an integer number (220542787590).

Almost surely, 2^661628362767 is an apocalyptic number.

661628362767 is a deficient number, since it is larger than the sum of its proper divisors (220542787593).

661628362767 is a wasteful number, since it uses less digits than its factorization.

661628362767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220542787592.

The product of its digits is 36578304, while the sum is 60.

The spelling of 661628362767 in words is "six hundred sixty-one billion, six hundred twenty-eight million, three hundred sixty-two thousand, seven hundred sixty-seven".