66155515495 has 4 divisors (see below), whose sum is σ = 79386618600. Its totient is φ = 52924412392.

The previous prime is 66155515493. The next prime is 66155515571. The reversal of 66155515495 is 59451555166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66155515495 - 2¹ = 66155515493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66155515493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6615551545 + ... + 6615551554.

It is an arithmetic number, because the mean of its divisors is an integer number (19846654650).

Almost surely, 2^66155515495 is an apocalyptic number.

66155515495 is a deficient number, since it is larger than the sum of its proper divisors (13231103105).

66155515495 is a wasteful number, since it uses less digits than its factorization.

66155515495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13231103104.

The product of its digits is 4050000, while the sum is 52.

The spelling of 66155515495 in words is "sixty-six billion, one hundred fifty-five million, five hundred fifteen thousand, four hundred ninety-five".