78205951947 has 16 divisors (see below), whose sum is σ = 106266297600. Its totient is φ = 51141903072.

The previous prime is 78205951937. The next prime is 78205951969. The reversal of 78205951947 is 74915950287.

It is not a de Polignac number, because 78205951947 - 2⁶ = 78205951883 is a prime.

It is a super-2 number, since 2×78205951947² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78205951937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 672304 + ... + 780002.

It is an arithmetic number, because the mean of its divisors is an integer number (6641643600).

Almost surely, 2^78205951947 is an apocalyptic number.

78205951947 is a deficient number, since it is larger than the sum of its proper divisors (28060345653).

78205951947 is a wasteful number, since it uses less digits than its factorization.

78205951947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112322.

The product of its (nonzero) digits is 6350400, while the sum is 57.

The spelling of 78205951947 in words is "seventy-eight billion, two hundred five million, nine hundred fifty-one thousand, nine hundred forty-seven".