625280016661 has 4 divisors (see below), whose sum is σ = 625327728300. Its totient is φ = 625232305024.

The previous prime is 625280016653. The next prime is 625280016679. The reversal of 625280016661 is 166610082526.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 216583198225 + 408696818436 = 465385^2 + 639294^2 .

It is a cyclic number.

It is not a de Polignac number, because 625280016661 - 2³ = 625280016653 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 (625280716661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23836156 + ... + 23862373.

It is an arithmetic number, because the mean of its divisors is an integer number (156331932075).

Almost surely, 2^625280016661 is an apocalyptic number.

It is an amenable number.

625280016661 is a deficient number, since it is larger than the sum of its proper divisors (47711639).

625280016661 is a wasteful number, since it uses less digits than its factorization.

625280016661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47711638.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 625280016661 in words is "six hundred twenty-five billion, two hundred eighty million, sixteen thousand, six hundred sixty-one".