61878936319 has 4 divisors (see below), whose sum is σ = 61886847960. Its totient is φ = 61871024680.

The previous prime is 61878936221. The next prime is 61878936331. The reversal of 61878936319 is 91363987816.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61878936319 - 2¹⁹ = 61878412031 is a prime.

It is a super-2 number, since 2×61878936319² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61878936619) 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, 3944077 + ... + 3959734.

It is an arithmetic number, because the mean of its divisors is an integer number (15471711990).

Almost surely, 2^61878936319 is an apocalyptic number.

61878936319 is a deficient number, since it is larger than the sum of its proper divisors (7911641).

61878936319 is an equidigital number, since it uses as much as digits as its factorization.

61878936319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911640.

The product of its digits is 11757312, while the sum is 61.

The spelling of 61878936319 in words is "sixty-one billion, eight hundred seventy-eight million, nine hundred thirty-six thousand, three hundred nineteen".