61621766425 has 6 divisors (see below), whose sum is σ = 76410990398. Its totient is φ = 49297413120.

The previous prime is 61621766383. The next prime is 61621766429. The reversal of 61621766425 is 52466712616.

It can be written as a sum of positive squares in 3 ways, for example, as 1196260569 + 60425505856 = 34587^2 + 245816^2 .

It is not a de Polignac number, because 61621766425 - 2²⁹ = 61084895513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61621766429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1232435304 + ... + 1232435353.

Almost surely, 2^61621766425 is an apocalyptic number.

It is an amenable number.

61621766425 is a deficient number, since it is larger than the sum of its proper divisors (14789223973).

61621766425 is a wasteful number, since it uses less digits than its factorization.

61621766425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464870667 (or 2464870662 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The spelling of 61621766425 in words is "sixty-one billion, six hundred twenty-one million, seven hundred sixty-six thousand, four hundred twenty-five".