66556406645031 has 8 divisors (see below), whose sum is σ = 88742584268800. Its totient is φ = 44370583392312.

The previous prime is 66556406644999. The next prime is 66556406645033. The reversal of 66556406645031 is 13054660465566.

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

It is not a de Polignac number, because 66556406645031 - 2⁵ = 66556406644999 is a prime.

It is a super-2 number, since 2×66556406645031² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66556406645033) 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, 88154215 + ... + 88906008.

It is an arithmetic number, because the mean of its divisors is an integer number (11092823033600).

Almost surely, 2^{66556406645031} is an apocalyptic number.

66556406645031 is a deficient number, since it is larger than the sum of its proper divisors (22186177623769).

66556406645031 is a wasteful number, since it uses less digits than its factorization.

66556406645031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177185525.

The product of its (nonzero) digits is 46656000, while the sum is 57.

The spelling of 66556406645031 in words is "sixty-six trillion, five hundred fifty-six billion, four hundred six million, six hundred forty-five thousand, thirty-one".