61878233287816 has 32 divisors (see below), whose sum is σ = 129512581308000. Its totient is φ = 27472365728640.

The previous prime is 61878233287799. The next prime is 61878233287817.

61878233287816 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (61878233287817) 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 7 ways as a sum of consecutive naturals, for example, 8176295541 + ... + 8176303108.

It is an arithmetic number, because the mean of its divisors is an integer number (4047268165875).

Almost surely, 2^{61878233287816} is an apocalyptic number.

It is an amenable number.

61878233287816 is an abundant number, since it is smaller than the sum of its proper divisors (67634348020184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61878233287816 is a wasteful number, since it uses less digits than its factorization.

61878233287816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16352598709 (or 16352598705 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 70.

The spelling of 61878233287816 in words is "sixty-one trillion, eight hundred seventy-eight billion, two hundred thirty-three million, two hundred eighty-seven thousand, eight hundred sixteen".