61415720511 has 16 divisors (see below), whose sum is σ = 82192900608. Its totient is φ = 40791312800.

The previous prime is 61415720501. The next prime is 61415720519. The reversal of 61415720511 is 11502751416.

It is a cyclic number.

It is not a de Polignac number, because 61415720511 - 2¹⁰ = 61415719487 is a prime.

It is a super-2 number, since 2×61415720511² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61415720519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1931401 + ... + 1962941.

It is an arithmetic number, because the mean of its divisors is an integer number (5137056288).

Almost surely, 2^61415720511 is an apocalyptic number.

61415720511 is a deficient number, since it is larger than the sum of its proper divisors (20777180097).

61415720511 is a wasteful number, since it uses less digits than its factorization.

61415720511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33942.

The product of its (nonzero) digits is 8400, while the sum is 33.

The spelling of 61415720511 in words is "sixty-one billion, four hundred fifteen million, seven hundred twenty thousand, five hundred eleven".