61180581541885 has 16 divisors (see below), whose sum is σ = 79087466067120. Its totient is φ = 45166174986240.

The previous prime is 61180581541883. The next prime is 61180581541897. The reversal of 61180581541885 is 58814518508116.

It can be written as a sum of positive squares in 8 ways, for example, as 2519289549529 + 58661291992356 = 1587227^2 + 7659066^2 .

It is not a de Polignac number, because 61180581541885 - 2¹ = 61180581541883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61180581541883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138646596 + ... + 139087165.

It is an arithmetic number, because the mean of its divisors is an integer number (4942966629195).

Almost surely, 2^{61180581541885} is an apocalyptic number.

61180581541885 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61180581541885 is a deficient number, since it is larger than the sum of its proper divisors (17906884525235).

61180581541885 is a wasteful number, since it uses less digits than its factorization.

61180581541885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277737168.

The product of its (nonzero) digits is 12288000, while the sum is 61.

The spelling of 61180581541885 in words is "sixty-one trillion, one hundred eighty billion, five hundred eighty-one million, five hundred forty-one thousand, eight hundred eighty-five".