61356340272 has 80 divisors (see below), whose sum is σ = 160213817088. Its totient is φ = 20231904000.

The previous prime is 61356340249. The next prime is 61356340277. The reversal of 61356340272 is 27204365316.

It is a self number, because there is not a number n which added to its sum of digits gives 61356340272.

It is not an unprimeable number, because it can be changed into a prime (61356340277) 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, 5002147 + ... + 5014397.

Almost surely, 2^61356340272 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 61356340272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80106908544).

61356340272 is an abundant number, since it is smaller than the sum of its proper divisors (98857476816).

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

61356340272 is a wasteful number, since it uses less digits than its factorization.

61356340272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13378 (or 13372 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 39.

The spelling of 61356340272 in words is "sixty-one billion, three hundred fifty-six million, three hundred forty thousand, two hundred seventy-two".