61256266641 has 24 divisors (see below), whose sum is σ = 88738793000. Its totient is φ = 40718764800.

The previous prime is 61256266579. The next prime is 61256266723. The reversal of 61256266641 is 14666265216.

It can be written as a sum of positive squares in 4 ways, for example, as 16641 + 61256250000 = 129^2 + 247500^2 .

It is not a de Polignac number, because 61256266641 - 2¹¹ = 61256264593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61256266241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10413021 + ... + 10418901.

Almost surely, 2^61256266641 is an apocalyptic number.

It is an amenable number.

61256266641 is a deficient number, since it is larger than the sum of its proper divisors (27482526359).

61256266641 is a wasteful number, since it uses less digits than its factorization.

61256266641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9057 (or 9054 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 61256266641 in words is "sixty-one billion, two hundred fifty-six million, two hundred sixty-six thousand, six hundred forty-one".