78105321477 has 6 divisors (see below), whose sum is σ = 112818797702. Its totient is φ = 52070214312.

The previous prime is 78105321451. The next prime is 78105321493. The reversal of 78105321477 is 77412350187.

78105321477 is a `hidden beast` number, since 78 + 1 + 0 + 532 + 1 + 47 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 67873796676 + 10231524801 = 260526^2 + 101151^2 .

It is not a de Polignac number, because 78105321477 - 2¹⁰ = 78105320453 is a prime.

It is a super-2 number, since 2×78105321477² (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 (78105326477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4339184518 + ... + 4339184535.

Almost surely, 2^78105321477 is an apocalyptic number.

It is an amenable number.

78105321477 is a deficient number, since it is larger than the sum of its proper divisors (34713476225).

78105321477 is a wasteful number, since it uses less digits than its factorization.

78105321477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8678369059 (or 8678369056 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The spelling of 78105321477 in words is "seventy-eight billion, one hundred five million, three hundred twenty-one thousand, four hundred seventy-seven".