61023610661 has 4 divisors (see below), whose sum is σ = 65717734572. Its totient is φ = 56329486752.

The previous prime is 61023610633. The next prime is 61023610667. The reversal of 61023610661 is 16601632016.

61023610661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10905833761 + 50117776900 = 104431^2 + 223870^2 .

It is a cyclic number.

It is not a de Polignac number, because 61023610661 - 2⁶ = 61023610597 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 (61023610667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2347061936 + ... + 2347061961.

It is an arithmetic number, because the mean of its divisors is an integer number (16429433643).

Almost surely, 2^61023610661 is an apocalyptic number.

It is an amenable number.

61023610661 is a deficient number, since it is larger than the sum of its proper divisors (4694123911).

61023610661 is a wasteful number, since it uses less digits than its factorization.

61023610661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694123910.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 61023610661 in words is "sixty-one billion, twenty-three million, six hundred ten thousand, six hundred sixty-one".