77950287993 has 4 divisors (see below), whose sum is σ = 103933717328. Its totient is φ = 51966858660.

The previous prime is 77950287983. The next prime is 77950287997. The reversal of 77950287993 is 39978205977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77950287993 - 2¹⁶ = 77950222457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77950287997) 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, 12991714663 + ... + 12991714668.

It is an arithmetic number, because the mean of its divisors is an integer number (25983429332).

Almost surely, 2^77950287993 is an apocalyptic number.

It is an amenable number.

77950287993 is a deficient number, since it is larger than the sum of its proper divisors (25983429335).

77950287993 is a wasteful number, since it uses less digits than its factorization.

77950287993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25983429334.

The product of its (nonzero) digits is 60011280, while the sum is 66.

The spelling of 77950287993 in words is "seventy-seven billion, nine hundred fifty million, two hundred eighty-seven thousand, nine hundred ninety-three".