61062857881 has 9 divisors (see below), whose sum is σ = 63248503773. Its totient is φ = 58950323040.

The previous prime is 61062857873. The next prime is 61062857897. The reversal of 61062857881 is 18875826016.

The square root of 61062857881 is 247109.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4447881 + 61058410000 = 2109^2 + 247100^2 .

It is not a de Polignac number, because 61062857881 - 2³ = 61062857873 is a prime.

It is a super-2 number, since 2×61062857881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61062857861) 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 8 ways as a sum of consecutive naturals, for example, 7161901 + ... + 7170421.

Almost surely, 2^61062857881 is an apocalyptic number.

61062857881 is the 247109-th square number.

61062857881 is the 123555-th centered octagonal number.

It is an amenable number.

61062857881 is a deficient number, since it is larger than the sum of its proper divisors (2185645892).

61062857881 is an frugal number, since it uses more digits than its factorization.

61062857881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17100 (or 8550 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 52.

The spelling of 61062857881 in words is "sixty-one billion, sixty-two million, eight hundred fifty-seven thousand, eight hundred eighty-one".