61641525321 has 12 divisors (see below), whose sum is σ = 89584004848. Its totient is φ = 40842236664.

The previous prime is 61641525299. The next prime is 61641525431. The reversal of 61641525321 is 12352514616.

61641525321 is a `hidden beast` number, since 6 + 1 + 641 + 5 + 2 + 5 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 61641525321 - 2⁷ = 61641525193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61641525721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21007915 + ... + 21010848.

Almost surely, 2^61641525321 is an apocalyptic number.

It is an amenable number.

61641525321 is a deficient number, since it is larger than the sum of its proper divisors (27942479527).

61641525321 is a wasteful number, since it uses less digits than its factorization.

61641525321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42018932 (or 42018929 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 61641525321 in words is "sixty-one billion, six hundred forty-one million, five hundred twenty-five thousand, three hundred twenty-one".