78213253611725 has 6 divisors (see below), whose sum is σ = 96984434478570. Its totient is φ = 62570602889360.

The previous prime is 78213253611707. The next prime is 78213253611749. The reversal of 78213253611725 is 52711635231287.

It can be written as a sum of positive squares in 3 ways, for example, as 12818315524 + 78200435296201 = 113218^2 + 8843101^2 .

It is not a de Polignac number, because 78213253611725 - 2³² = 78208958644429 is a prime.

It is a super-2 number, since 2×78213253611725² (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 in 5 ways as a sum of consecutive naturals, for example, 1564265072210 + ... + 1564265072259.

It is an arithmetic number, because the mean of its divisors is an integer number (16164072413095).

Almost surely, 2^{78213253611725} is an apocalyptic number.

It is an amenable number.

78213253611725 is a deficient number, since it is larger than the sum of its proper divisors (18771180866845).

78213253611725 is a wasteful number, since it uses less digits than its factorization.

78213253611725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128530144479 (or 3128530144474 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 53.

The spelling of 78213253611725 in words is "seventy-eight trillion, two hundred thirteen billion, two hundred fifty-three million, six hundred eleven thousand, seven hundred twenty-five".