78325850553561 has 48 divisors (see below), whose sum is σ = 122598253150464. Its totient is φ = 47900773049472.

The previous prime is 78325850553521. The next prime is 78325850553569. The reversal of 78325850553561 is 16535505852387.

78325850553561 is a `hidden beast` number, since 7 + 8 + 3 + 25 + 8 + 5 + 0 + 553 + 56 + 1 = 666.

It is not a de Polignac number, because 78325850553561 - 2¹⁵ = 78325850520793 is a prime.

It is a super-2 number, since 2×78325850553561² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78325850553569) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 84082035 + ... + 85008471.

It is an arithmetic number, because the mean of its divisors is an integer number (2554130273968).

Almost surely, 2^{78325850553561} is an apocalyptic number.

It is an amenable number.

78325850553561 is a deficient number, since it is larger than the sum of its proper divisors (44272402596903).

78325850553561 is a wasteful number, since it uses less digits than its factorization.

78325850553561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930950 (or 930947 counting only the distinct ones).

The product of its (nonzero) digits is 151200000, while the sum is 63.

The spelling of 78325850553561 in words is "seventy-eight trillion, three hundred twenty-five billion, eight hundred fifty million, five hundred fifty-three thousand, five hundred sixty-one".