66841625515 has 32 divisors (see below), whose sum is σ = 93686943744. Its totient is φ = 44826462720.

The previous prime is 66841625507. The next prime is 66841625519. The reversal of 66841625515 is 51552614866.

It is not a de Polignac number, because 66841625515 - 2³ = 66841625507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66841625519) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2366275 + ... + 2394355.

It is an arithmetic number, because the mean of its divisors is an integer number (2927716992).

Almost surely, 2^66841625515 is an apocalyptic number.

66841625515 is a deficient number, since it is larger than the sum of its proper divisors (26845318229).

66841625515 is a wasteful number, since it uses less digits than its factorization.

66841625515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29587.

The product of its digits is 1728000, while the sum is 49.

The spelling of 66841625515 in words is "sixty-six billion, eight hundred forty-one million, six hundred twenty-five thousand, five hundred fifteen".