77925703987 has 4 divisors (see below), whose sum is σ = 78207024496. Its totient is φ = 77644383480.

The previous prime is 77925703951. The next prime is 77925704011. The reversal of 77925703987 is 78930752977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78930752977 = 89 ⋅886862393.

It is a cyclic number.

It is not a de Polignac number, because 77925703987 - 2⁷ = 77925703859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77925703907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140659839 + ... + 140660392.

It is an arithmetic number, because the mean of its divisors is an integer number (19551756124).

Almost surely, 2^77925703987 is an apocalyptic number.

77925703987 is a deficient number, since it is larger than the sum of its proper divisors (281320509).

77925703987 is a wasteful number, since it uses less digits than its factorization.

77925703987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281320508.

The product of its (nonzero) digits is 46675440, while the sum is 64.

The spelling of 77925703987 in words is "seventy-seven billion, nine hundred twenty-five million, seven hundred three thousand, nine hundred eighty-seven".