66936629425 has 12 divisors (see below), whose sum is σ = 83071737756. Its totient is φ = 53503937600.

The previous prime is 66936629411. The next prime is 66936629471. The reversal of 66936629425 is 52492663966.

It can be written as a sum of positive squares in 6 ways, for example, as 1952932864 + 64983696561 = 44192^2 + 254919^2 .

It is not a de Polignac number, because 66936629425 - 2³¹ = 64789145777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66936629425.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1104034 + ... + 1163083.

It is an arithmetic number, because the mean of its divisors is an integer number (6922644813).

Almost surely, 2^66936629425 is an apocalyptic number.

It is an amenable number.

66936629425 is a deficient number, since it is larger than the sum of its proper divisors (16135108331).

66936629425 is a wasteful number, since it uses less digits than its factorization.

66936629425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268308 (or 2268303 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 58.

The spelling of 66936629425 in words is "sixty-six billion, nine hundred thirty-six million, six hundred twenty-nine thousand, four hundred twenty-five".