661360623 has 32 divisors (see below), whose sum is σ = 1101288960. Its totient is φ = 342975360.

The previous prime is 661360621. The next prime is 661360633. The reversal of 661360623 is 326063166.

It is a happy number.

It is not a de Polignac number, because 661360623 - 2¹ = 661360621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661360621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154273 + ... + 158501.

It is an arithmetic number, because the mean of its divisors is an integer number (34415280).

Almost surely, 2^661360623 is an apocalyptic number.

661360623 is a deficient number, since it is larger than the sum of its proper divisors (439928337).

661360623 is a wasteful number, since it uses less digits than its factorization.

661360623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4927.

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 661360623 is about 25716.9326125804. The cubic root of 661360623 is about 871.2566606395.

The spelling of 661360623 in words is "six hundred sixty-one million, three hundred sixty thousand, six hundred twenty-three".