61205652020 has 12 divisors (see below), whose sum is σ = 128531869284. Its totient is φ = 24482260800.

The previous prime is 61205651981. The next prime is 61205652023. The reversal of 61205652020 is 2025650216.

It can be written as a sum of positive squares in 2 ways, for example, as 26831750416 + 34373901604 = 163804^2 + 185402^2 .

It is a super-2 number, since 2×61205652020² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61205652023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1530141281 + ... + 1530141320.

It is an arithmetic number, because the mean of its divisors is an integer number (10710989107).

Almost surely, 2^61205652020 is an apocalyptic number.

It is an amenable number.

61205652020 is an abundant number, since it is smaller than the sum of its proper divisors (67326217264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61205652020 is a wasteful number, since it uses less digits than its factorization.

61205652020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3060282610 (or 3060282608 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 61205652020 in words is "sixty-one billion, two hundred five million, six hundred fifty-two thousand, twenty".