77975293157 has 2 divisors, whose sum is σ = 77975293158. Its totient is φ = 77975293156.

The previous prime is 77975293091. The next prime is 77975293199. The reversal of 77975293157 is 75139257977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48446651236 + 29528641921 = 220106^2 + 171839^2 .

It is a cyclic number.

It is not a de Polignac number, because 77975293157 - 2¹² = 77975289061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77975293157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77975293057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38987646578 + 38987646579.

It is an arithmetic number, because the mean of its divisors is an integer number (38987646579).

Almost surely, 2^77975293157 is an apocalyptic number.

It is an amenable number.

77975293157 is a deficient number, since it is larger than the sum of its proper divisors (1).

77975293157 is an equidigital number, since it uses as much as digits as its factorization.

77975293157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29172150, while the sum is 62.

The spelling of 77975293157 in words is "seventy-seven billion, nine hundred seventy-five million, two hundred ninety-three thousand, one hundred fifty-seven".