61851796272 has 240 divisors, whose sum is σ = 202321836288. Its totient is φ = 17273018880.

The previous prime is 61851796247. The next prime is 61851796289. The reversal of 61851796272 is 27269715816.

61851796272 is a `hidden beast` number, since 6 + 1 + 8 + 5 + 1 + 7 + 9 + 627 + 2 = 666.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 15116947 + ... + 15121037.

Almost surely, 2^61851796272 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 61851796272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101160918144).

61851796272 is an abundant number, since it is smaller than the sum of its proper divisors (140470040016).

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

61851796272 is a wasteful number, since it uses less digits than its factorization.

61851796272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448 (or 4439 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The spelling of 61851796272 in words is "sixty-one billion, eight hundred fifty-one million, seven hundred ninety-six thousand, two hundred seventy-two".