61649996391 has 12 divisors (see below), whose sum is σ = 91922575680. Its totient is φ = 39774191040.

The previous prime is 61649996383. The next prime is 61649996393. The reversal of 61649996391 is 19369994616.

61649996391 is a `hidden beast` number, since 616 + 4 + 9 + 9 + 9 + 6 + 3 + 9 + 1 = 666.

It is not a de Polignac number, because 61649996391 - 2³ = 61649996383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61649996393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110483586 + ... + 110484143.

It is an arithmetic number, because the mean of its divisors is an integer number (7660214640).

Almost surely, 2^61649996391 is an apocalyptic number.

61649996391 is a deficient number, since it is larger than the sum of its proper divisors (30272579289).

61649996391 is a wasteful number, since it uses less digits than its factorization.

61649996391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220967766 (or 220967763 counting only the distinct ones).

The product of its digits is 17006112, while the sum is 63.

The spelling of 61649996391 in words is "sixty-one billion, six hundred forty-nine million, nine hundred ninety-six thousand, three hundred ninety-one".