77478897971 has 8 divisors (see below), whose sum is σ = 77838789600. Its totient is φ = 77119194240.

The previous prime is 77478897941. The next prime is 77478898019. The reversal of 77478897971 is 17979887477.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77478897971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77478897941) 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, 816290 + ... + 906248.

It is an arithmetic number, because the mean of its divisors is an integer number (9729848700).

Almost surely, 2^77478897971 is an apocalyptic number.

77478897971 is a deficient number, since it is larger than the sum of its proper divisors (359891629).

77478897971 is a wasteful number, since it uses less digits than its factorization.

77478897971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93949.

The product of its digits is 348509952, while the sum is 74.

The spelling of 77478897971 in words is "seventy-seven billion, four hundred seventy-eight million, eight hundred ninety-seven thousand, nine hundred seventy-one".