66261604301 has 12 divisors (see below), whose sum is σ = 67644587004. Its totient is φ = 64905758400.

The previous prime is 66261604289. The next prime is 66261604307. The reversal of 66261604301 is 10340616266.

It can be written as a sum of positive squares in 2 ways, for example, as 42910708201 + 23350896100 = 207149^2 + 152810^2 .

It is not a de Polignac number, because 66261604301 - 2³⁴ = 49081735117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66261604307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 944291 + ... + 1012031.

It is an arithmetic number, because the mean of its divisors is an integer number (5637048917).

Almost surely, 2^66261604301 is an apocalyptic number.

It is an amenable number.

66261604301 is a deficient number, since it is larger than the sum of its proper divisors (1382982703).

66261604301 is an equidigital number, since it uses as much as digits as its factorization.

66261604301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68140 (or 68081 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 66261604301 in words is "sixty-six billion, two hundred sixty-one million, six hundred four thousand, three hundred one".