66561040015151 has 8 divisors (see below), whose sum is σ = 72612134777808. Its totient is φ = 60509960440000.

The previous prime is 66561040015123. The next prime is 66561040015159. The reversal of 66561040015151 is 15151004016566.

It is a happy number.

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 66561040015151 - 2³⁰ = 66559966273327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66561040015099 and 66561040015108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66561040015159) 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, 6606041 + ... + 13295181.

It is an arithmetic number, because the mean of its divisors is an integer number (9076516847226).

Almost surely, 2^{66561040015151} is an apocalyptic number.

66561040015151 is a deficient number, since it is larger than the sum of its proper divisors (6051094762657).

66561040015151 is a wasteful number, since it uses less digits than its factorization.

66561040015151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7593753.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 66561040015151 in words is "sixty-six trillion, five hundred sixty-one billion, forty million, fifteen thousand, one hundred fifty-one".