61615587279012 has 96 divisors (see below), whose sum is σ = 159032946307200. Its totient is φ = 18443987960832.

The previous prime is 61615587278951. The next prime is 61615587279013. The reversal of 61615587279012 is 21097278551616.

It is a happy number.

It is a super-2 number, since 2×61615587279012² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61615587279013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46790664 + ... + 48089472.

It is an arithmetic number, because the mean of its divisors is an integer number (1656593190700).

Almost surely, 2^{61615587279012} 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 61615587279012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79516473153600).

61615587279012 is an abundant number, since it is smaller than the sum of its proper divisors (97417359028188).

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

61615587279012 is a wasteful number, since it uses less digits than its factorization.

61615587279012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307085 (or 1307083 counting only the distinct ones).

The product of its (nonzero) digits is 12700800, while the sum is 60.

The spelling of 61615587279012 in words is "sixty-one trillion, six hundred fifteen billion, five hundred eighty-seven million, two hundred seventy-nine thousand, twelve".