61587320644038 has 64 divisors (see below), whose sum is σ = 140814758707200. Its totient is φ = 17590910817312.

The previous prime is 61587320643997. The next prime is 61587320644079. The reversal of 61587320644038 is 83044602378516.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61587320643997) and next prime (61587320644079).

It is a super-2 number, since 2×61587320644038² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2299479595 + ... + 2299506377.

It is an arithmetic number, because the mean of its divisors is an integer number (2200230604800).

Almost surely, 2^{61587320644038} is an apocalyptic number.

61587320644038 is an abundant number, since it is smaller than the sum of its proper divisors (79227438063162).

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

61587320644038 is a wasteful number, since it uses less digits than its factorization.

61587320644038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41761.

The product of its (nonzero) digits is 23224320, while the sum is 57.

The spelling of 61587320644038 in words is "sixty-one trillion, five hundred eighty-seven billion, three hundred twenty million, six hundred forty-four thousand, thirty-eight".