665542012623 has 8 divisors (see below), whose sum is σ = 889946669568. Its totient is φ = 442416015384.

The previous prime is 665542012579. The next prime is 665542012651. The reversal of 665542012623 is 326210245566.

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

It is not a de Polignac number, because 665542012623 - 2¹⁶ = 665541947087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665542012423) 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, 319663711 + ... + 319665792.

It is an arithmetic number, because the mean of its divisors is an integer number (111243333696).

Almost surely, 2^665542012623 is an apocalyptic number.

665542012623 is a deficient number, since it is larger than the sum of its proper divisors (224404656945).

665542012623 is a wasteful number, since it uses less digits than its factorization.

665542012623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639329853.

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 665542012623 in words is "six hundred sixty-five billion, five hundred forty-two million, twelve thousand, six hundred twenty-three".