66620264800261 has 8 divisors (see below), whose sum is σ = 68364901589600. Its totient is φ = 64884506570352.

The previous prime is 66620264800241. The next prime is 66620264800319. The reversal of 66620264800261 is 16200846202666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66620264800261 - 2¹⁵ = 66620264767493 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 (66620264800231) 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, 2219624655 + ... + 2219654668.

It is an arithmetic number, because the mean of its divisors is an integer number (8545612698700).

Almost surely, 2^{66620264800261} is an apocalyptic number.

It is an amenable number.

66620264800261 is a deficient number, since it is larger than the sum of its proper divisors (1744636789339).

66620264800261 is a wasteful number, since it uses less digits than its factorization.

66620264800261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439279715.

The product of its (nonzero) digits is 1990656, while the sum is 49.

The spelling of 66620264800261 in words is "sixty-six trillion, six hundred twenty billion, two hundred sixty-four million, eight hundred thousand, two hundred sixty-one".