620544626161 has 8 divisors (see below), whose sum is σ = 624204996264. Its totient is φ = 616885100160.

The previous prime is 620544626089. The next prime is 620544626189. The reversal of 620544626161 is 161626445026.

It can be written as a sum of positive squares in 4 ways, for example, as 405044417761 + 215500208400 = 636431^2 + 464220^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 620544626161 - 2¹⁵ = 620544593393 is a prime.

It is a super-4 number, since 4×620544626161⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620544620161) 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, 1295215 + ... + 1708411.

It is an arithmetic number, because the mean of its divisors is an integer number (78025624533).

Almost surely, 2^620544626161 is an apocalyptic number.

It is an amenable number.

620544626161 is a deficient number, since it is larger than the sum of its proper divisors (3660370103).

620544626161 is a wasteful number, since it uses less digits than its factorization.

620544626161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422051.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 620544626161 in words is "six hundred twenty billion, five hundred forty-four million, six hundred twenty-six thousand, one hundred sixty-one".