77025640947 has 4 divisors (see below), whose sum is σ = 102700854600. Its totient is φ = 51350427296.

The previous prime is 77025640943. The next prime is 77025640963. The reversal of 77025640947 is 74904652077.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77025640947 - 2² = 77025640943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77025640947.

It is not an unprimeable number, because it can be changed into a prime (77025640943) 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 3 ways as a sum of consecutive naturals, for example, 12837606822 + ... + 12837606827.

It is an arithmetic number, because the mean of its divisors is an integer number (25675213650).

Almost surely, 2^77025640947 is an apocalyptic number.

77025640947 is a deficient number, since it is larger than the sum of its proper divisors (25675213653).

77025640947 is a wasteful number, since it uses less digits than its factorization.

77025640947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25675213652.

The product of its (nonzero) digits is 2963520, while the sum is 51.

The spelling of 77025640947 in words is "seventy-seven billion, twenty-five million, six hundred forty thousand, nine hundred forty-seven".