56666501089665 has 32 divisors (see below), whose sum is σ = 91582597589760. Its totient is φ = 29917964273664.

The previous prime is 56666501089663. The next prime is 56666501089669. The reversal of 56666501089665 is 56698010566665.

It is not a de Polignac number, because 56666501089665 - 2¹ = 56666501089663 is a prime.

It is a super-2 number, since 2×56666501089665² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56666501089665.

It is not an unprimeable number, because it can be changed into a prime (56666501089663) 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, 37667464 + ... + 39142953.

It is an arithmetic number, because the mean of its divisors is an integer number (2861956174680).

Almost surely, 2^{56666501089665} is an apocalyptic number.

It is an amenable number.

56666501089665 is a deficient number, since it is larger than the sum of its proper divisors (34916096500095).

56666501089665 is a wasteful number, since it uses less digits than its factorization.

56666501089665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76810921.

The product of its (nonzero) digits is 419904000, while the sum is 69.

The spelling of 56666501089665 in words is "fifty-six trillion, six hundred sixty-six billion, five hundred one million, eighty-nine thousand, six hundred sixty-five".