78780000817969 has 8 divisors (see below), whose sum is σ = 87563362830912. Its totient is φ = 70266896097840.

The previous prime is 78780000817967. The next prime is 78780000817979. The reversal of 78780000817969 is 96971800008787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78780000817969 - 2¹ = 78780000817967 is a prime.

It is a super-2 number, since 2×78780000817969² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78780000817898 and 78780000817907.

It is not an unprimeable number, because it can be changed into a prime (78780000817967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67564322589 + ... + 67564323754.

It is an arithmetic number, because the mean of its divisors is an integer number (10945420353864).

Almost surely, 2^{78780000817969} is an apocalyptic number.

It is an amenable number.

78780000817969 is a deficient number, since it is larger than the sum of its proper divisors (8783362012943).

78780000817969 is a wasteful number, since it uses less digits than its factorization.

78780000817969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135128646407.

The product of its (nonzero) digits is 85349376, while the sum is 70.

The spelling of 78780000817969 in words is "seventy-eight trillion, seven hundred eighty billion, eight hundred seventeen thousand, nine hundred sixty-nine".