61715100072 has 64 divisors (see below), whose sum is σ = 157856146560. Its totient is φ = 20100384000.

The previous prime is 61715100067. The next prime is 61715100079. The reversal of 61715100072 is 27000151716.

It is not an unprimeable number, because it can be changed into a prime (61715100079) 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, 81478 + ... + 360650.

It is an arithmetic number, because the mean of its divisors is an integer number (2466502290).

Almost surely, 2^61715100072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61715100072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78928073280).

61715100072 is an abundant number, since it is smaller than the sum of its proper divisors (96141046488).

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

61715100072 is a wasteful number, since it uses less digits than its factorization.

61715100072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279394 (or 279390 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 30.

Adding to 61715100072 its reverse (27000151716), we get a palindrome (88715251788).

The spelling of 61715100072 in words is "sixty-one billion, seven hundred fifteen million, one hundred thousand, seventy-two".