78242370484861 has 64 divisors (see below), whose sum is σ = 88455293245440. Its totient is φ = 68584519376640.

The previous prime is 78242370484807. The next prime is 78242370484897. The reversal of 78242370484861 is 16848407324287.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78242370484861 - 2¹⁵ = 78242370452093 is a prime.

It is a super-2 number, since 2×78242370484861² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78242370484793 and 78242370484802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78242370484261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21477453706 + ... + 21477457348.

It is an arithmetic number, because the mean of its divisors is an integer number (1382113956960).

Almost surely, 2^{78242370484861} is an apocalyptic number.

It is an amenable number.

78242370484861 is a deficient number, since it is larger than the sum of its proper divisors (10212922760579).

78242370484861 is a wasteful number, since it uses less digits than its factorization.

78242370484861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4946.

The product of its (nonzero) digits is 115605504, while the sum is 64.

The spelling of 78242370484861 in words is "seventy-eight trillion, two hundred forty-two billion, three hundred seventy million, four hundred eighty-four thousand, eight hundred sixty-one".