61619738391 has 10 divisors (see below), whose sum is σ = 92049238952. Its totient is φ = 41079825540.

The previous prime is 61619738351. The next prime is 61619738393. The reversal of 61619738391 is 19383791616.

It is a happy number.

61619738391 is a `hidden beast` number, since 6 + 161 + 97 + 3 + 8 + 391 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-61619738391 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 (61619738393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 380368675 + ... + 380368836.

Almost surely, 2^61619738391 is an apocalyptic number.

61619738391 is a deficient number, since it is larger than the sum of its proper divisors (30429500561).

61619738391 is an equidigital number, since it uses as much as digits as its factorization.

61619738391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760737523 (or 760737514 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The spelling of 61619738391 in words is "sixty-one billion, six hundred nineteen million, seven hundred thirty-eight thousand, three hundred ninety-one".