61106651561 has 8 divisors (see below), whose sum is σ = 61655185704. Its totient is φ = 60559603200.

The previous prime is 61106651533. The next prime is 61106651563. The reversal of 61106651561 is 16515660116.

61106651561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 22147392400 + 38959259161 = 148820^2 + 197381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61106651561 - 2⁶ = 61106651497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61106651563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288740 + ... + 453413.

It is an arithmetic number, because the mean of its divisors is an integer number (7706898213).

Almost surely, 2^61106651561 is an apocalyptic number.

It is an amenable number.

61106651561 is a deficient number, since it is larger than the sum of its proper divisors (548534143).

61106651561 is a wasteful number, since it uses less digits than its factorization.

61106651561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742891.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 61106651561 in words is "sixty-one billion, one hundred six million, six hundred fifty-one thousand, five hundred sixty-one".