61890643061 has 8 divisors (see below), whose sum is σ = 66830157240. Its totient is φ = 56976656832.

The previous prime is 61890643049. The next prime is 61890643063. The reversal of 61890643061 is 16034609816.

It is a happy number.

61890643061 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 1583562436 + 60307080625 = 39794^2 + 245575^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61890643061 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 (61890643063) 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, 6376946 + ... + 6386643.

It is an arithmetic number, because the mean of its divisors is an integer number (8353769655).

Almost surely, 2^61890643061 is an apocalyptic number.

It is an amenable number.

61890643061 is a deficient number, since it is larger than the sum of its proper divisors (4939514179).

61890643061 is a wasteful number, since it uses less digits than its factorization.

61890643061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12763975.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 61890643061 in words is "sixty-one billion, eight hundred ninety million, six hundred forty-three thousand, sixty-one".