78141051781 has 8 divisors (see below), whose sum is σ = 84156777824. Its totient is φ = 72126022320.

The previous prime is 78141051773. The next prime is 78141051799. The reversal of 78141051781 is 18715014187.

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 78141051781 - 2³ = 78141051773 is a prime.

It is a super-2 number, since 2×78141051781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78141051181) 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, 71710 + ... + 401776.

It is an arithmetic number, because the mean of its divisors is an integer number (10519597228).

Almost surely, 2^78141051781 is an apocalyptic number.

It is an amenable number.

78141051781 is a deficient number, since it is larger than the sum of its proper divisors (6015726043).

78141051781 is a wasteful number, since it uses less digits than its factorization.

78141051781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348291.

The product of its (nonzero) digits is 62720, while the sum is 43.

The spelling of 78141051781 in words is "seventy-eight billion, one hundred forty-one million, fifty-one thousand, seven hundred eighty-one".