77954481313 has 4 divisors (see below), whose sum is σ = 77955474688. Its totient is φ = 77953487940.

The previous prime is 77954481289. The next prime is 77954481347. The reversal of 77954481313 is 31318445977.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 77954481313 - 2²¹ = 77952384161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77954481383) 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, 367833 + ... + 539638.

It is an arithmetic number, because the mean of its divisors is an integer number (19488868672).

Almost surely, 2^77954481313 is an apocalyptic number.

It is an amenable number.

77954481313 is a deficient number, since it is larger than the sum of its proper divisors (993375).

77954481313 is an equidigital number, since it uses as much as digits as its factorization.

77954481313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993374.

The product of its digits is 2540160, while the sum is 52.

The spelling of 77954481313 in words is "seventy-seven billion, nine hundred fifty-four million, four hundred eighty-one thousand, three hundred thirteen".