66155515494 has 16 divisors (see below), whose sum is σ = 132323188032. Its totient is φ = 22049812328.

The previous prime is 66155515493. The next prime is 66155515571. The reversal of 66155515494 is 49451555166.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 435024 + ... + 567059.

It is an arithmetic number, because the mean of its divisors is an integer number (8270199252).

Almost surely, 2^66155515494 is an apocalyptic number.

66155515494 is an abundant number, since it is smaller than the sum of its proper divisors (66167672538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66155515494 is a wasteful number, since it uses less digits than its factorization.

66155515494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013091.

The product of its digits is 3240000, while the sum is 51.

The spelling of 66155515494 in words is "sixty-six billion, one hundred fifty-five million, five hundred fifteen thousand, four hundred ninety-four".