77218501051 has 2 divisors, whose sum is σ = 77218501052. Its totient is φ = 77218501050.

The previous prime is 77218501049. The next prime is 77218501079. The reversal of 77218501051 is 15010581277.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77218501051 - 2¹ = 77218501049 is a prime.

Together with 77218501049, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 77218501051.

It is not a weakly prime, because it can be changed into another prime (77218501021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38609250525 + 38609250526.

It is an arithmetic number, because the mean of its divisors is an integer number (38609250526).

Almost surely, 2^77218501051 is an apocalyptic number.

77218501051 is a deficient number, since it is larger than the sum of its proper divisors (1).

77218501051 is an equidigital number, since it uses as much as digits as its factorization.

77218501051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19600, while the sum is 37.

The spelling of 77218501051 in words is "seventy-seven billion, two hundred eighteen million, five hundred one thousand, fifty-one".