61240729511 has 16 divisors (see below), whose sum is σ = 66400871040. Its totient is φ = 56145247200.

The previous prime is 61240729481. The next prime is 61240729523. The reversal of 61240729511 is 11592704216.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61240729511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61240729531) 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, 3421736 + ... + 3439586.

It is an arithmetic number, because the mean of its divisors is an integer number (4150054440).

Almost surely, 2^61240729511 is an apocalyptic number.

61240729511 is a deficient number, since it is larger than the sum of its proper divisors (5160141529).

61240729511 is a wasteful number, since it uses less digits than its factorization.

61240729511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19646.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 61240729511 in words is "sixty-one billion, two hundred forty million, seven hundred twenty-nine thousand, five hundred eleven".