78285615152644 has 6 divisors (see below), whose sum is σ = 136999826517134. Its totient is φ = 39142807576320.

The previous prime is 78285615152579. The next prime is 78285615152653. The reversal of 78285615152644 is 44625151658287.

It can be written as a sum of positive squares in only one way, i.e., 78285546759744 + 68392900 = 8847912^2 + 8270^2 .

It is a super-2 number, since 2×78285615152644² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9785701894077 + ... + 9785701894084.

Almost surely, 2^{78285615152644} is an apocalyptic number.

It is an amenable number.

78285615152644 is a deficient number, since it is larger than the sum of its proper divisors (58714211364490).

78285615152644 is a wasteful number, since it uses less digits than its factorization.

78285615152644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19571403788165 (or 19571403788163 counting only the distinct ones).

The product of its digits is 129024000, while the sum is 64.

The spelling of 78285615152644 in words is "seventy-eight trillion, two hundred eighty-five billion, six hundred fifteen million, one hundred fifty-two thousand, six hundred forty-four".