66888561403 has 8 divisors (see below), whose sum is σ = 71214474240. Its totient is φ = 62606125440.

The previous prime is 66888561371. The next prime is 66888561413. The reversal of 66888561403 is 30416588866.

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

It is a cyclic number.

It is not a de Polignac number, because 66888561403 - 2⁵ = 66888561371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66888561413) 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, 10866043 + ... + 10872196.

It is an arithmetic number, because the mean of its divisors is an integer number (8901809280).

Almost surely, 2^66888561403 is an apocalyptic number.

66888561403 is a deficient number, since it is larger than the sum of its proper divisors (4325912837).

66888561403 is a wasteful number, since it uses less digits than its factorization.

66888561403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21738437.

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 66888561403 in words is "sixty-six billion, eight hundred eighty-eight million, five hundred sixty-one thousand, four hundred three".