61281556753 has 16 divisors (see below), whose sum is σ = 64587600000. Its totient is φ = 58029903360.

The previous prime is 61281556657. The next prime is 61281556781. The reversal of 61281556753 is 35765518216.

It is a cyclic number.

It is not a de Polignac number, because 61281556753 - 2²¹ = 61279459601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61281556697 and 61281556706.

It is not an unprimeable number, because it can be changed into a prime (61281556783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3121458 + ... + 3141028.

It is an arithmetic number, because the mean of its divisors is an integer number (4036725000).

Almost surely, 2^61281556753 is an apocalyptic number.

It is an amenable number.

61281556753 is a deficient number, since it is larger than the sum of its proper divisors (3306043247).

61281556753 is a wasteful number, since it uses less digits than its factorization.

61281556753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20952.

The product of its digits is 1512000, while the sum is 49.

The spelling of 61281556753 in words is "sixty-one billion, two hundred eighty-one million, five hundred fifty-six thousand, seven hundred fifty-three".