78202283706644 has 6 divisors (see below), whose sum is σ = 136853996486634. Its totient is φ = 39101141853320.

The previous prime is 78202283706583. The next prime is 78202283706697. The reversal of 78202283706644 is 44660738220287.

It can be written as a sum of positive squares in only one way, i.e., 39156806851600 + 39045476855044 = 6257540^2 + 6248638^2 .

It is a super-2 number, since 2×78202283706644² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9775285463327 + ... + 9775285463334.

It is an arithmetic number, because the mean of its divisors is an integer number (22808999414439).

Almost surely, 2^{78202283706644} is an apocalyptic number.

It is an amenable number.

78202283706644 is a deficient number, since it is larger than the sum of its proper divisors (58651712779990).

78202283706644 is a wasteful number, since it uses less digits than its factorization.

78202283706644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19550570926665 (or 19550570926663 counting only the distinct ones).

The product of its (nonzero) digits is 43352064, while the sum is 59.

The spelling of 78202283706644 in words is "seventy-eight trillion, two hundred two billion, two hundred eighty-three million, seven hundred six thousand, six hundred forty-four".