61260705081 has 63 divisors (see below), whose sum is σ = 93803274399. Its totient is φ = 39989534112.

The previous prime is 61260705067. The next prime is 61260705109. The reversal of 61260705081 is 18050706216.

The square root of 61260705081 is 247509.

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

61260705081 is a `hidden beast` number, since 61 + 26 + 0 + 70 + 508 + 1 = 666.

61260705081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11763354681 + 49497350400 = 108459^2 + 222480^2 .

It is not a de Polignac number, because 61260705081 - 2²¹ = 61258607929 is a prime.

It is a super-2 number, since 2×61260705081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61260705581) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 594764076 + ... + 594764178.

Almost surely, 2^61260705081 is an apocalyptic number.

61260705081 is the 247509-th square number.

61260705081 is the 123755-th centered octagonal number.

It is an amenable number.

61260705081 is a deficient number, since it is larger than the sum of its proper divisors (32542569318).

61260705081 is an frugal number, since it uses more digits than its factorization.

61260705081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Multiplying 61260705081 by its sum of digits (36), we get a square (2205385382916 = 1485054²).

The spelling of 61260705081 in words is "sixty-one billion, two hundred sixty million, seven hundred five thousand, eighty-one".