61261221360 has 80 divisors (see below), whose sum is σ = 189976590720. Its totient is φ = 16330579200.

The previous prime is 61261221319. The next prime is 61261221367. The reversal of 61261221360 is 6312216216.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61261221367) 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 15 ways as a sum of consecutive naturals, for example, 661935 + ... + 748785.

It is an arithmetic number, because the mean of its divisors is an integer number (2374707384).

Almost surely, 2^61261221360 is an apocalyptic number.

61261221360 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61261221360 is an abundant number, since it is smaller than the sum of its proper divisors (128715369360).

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

61261221360 is a wasteful number, since it uses less digits than its factorization.

61261221360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89806 (or 89800 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 61261221360 its reverse (6312216216), we get a palindrome (67573437576).

The spelling of 61261221360 in words is "sixty-one billion, two hundred sixty-one million, two hundred twenty-one thousand, three hundred sixty".