61879438393 has 4 divisors (see below), whose sum is σ = 65136250960. Its totient is φ = 58622625828.

The previous prime is 61879438367. The next prime is 61879438417. The reversal of 61879438393 is 39383497816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61879438393 - 2⁹ = 61879437881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61879438333) 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 3 ways as a sum of consecutive naturals, for example, 1628406255 + ... + 1628406292.

It is an arithmetic number, because the mean of its divisors is an integer number (16284062740).

Almost surely, 2^61879438393 is an apocalyptic number.

It is an amenable number.

61879438393 is a deficient number, since it is larger than the sum of its proper divisors (3256812567).

61879438393 is a wasteful number, since it uses less digits than its factorization.

61879438393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3256812566.

The product of its digits is 23514624, while the sum is 61.

The spelling of 61879438393 in words is "sixty-one billion, eight hundred seventy-nine million, four hundred thirty-eight thousand, three hundred ninety-three".