61894025689 has 4 divisors (see below), whose sum is σ = 61894820260. Its totient is φ = 61893231120.

The previous prime is 61894025671. The next prime is 61894025693. The reversal of 61894025689 is 98652049816.

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 33633726025 + 28260299664 = 183395^2 + 168108^2 .

It is a cyclic number.

It is not a de Polignac number, because 61894025689 - 2⁵ = 61894025657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61894022689) 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, 265974 + ... + 441055.

It is an arithmetic number, because the mean of its divisors is an integer number (15473705065).

Almost surely, 2^61894025689 is an apocalyptic number.

It is an amenable number.

61894025689 is a deficient number, since it is larger than the sum of its proper divisors (794571).

61894025689 is an equidigital number, since it uses as much as digits as its factorization.

61894025689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794570.

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 61894025689 in words is "sixty-one billion, eight hundred ninety-four million, twenty-five thousand, six hundred eighty-nine".