75121214977 has 2 divisors, whose sum is σ = 75121214978. Its totient is φ = 75121214976.

The previous prime is 75121214923. The next prime is 75121214989. The reversal of 75121214977 is 77941212157.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64413932401 + 10707282576 = 253799^2 + 103476^2 .

It is an emirp because it is prime and its reverse (77941212157) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75121214977 - 2²⁷ = 74986997249 is a prime.

It is a super-2 number, since 2×75121214977² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (75121614977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37560607488 + 37560607489.

It is an arithmetic number, because the mean of its divisors is an integer number (37560607489).

Almost surely, 2^75121214977 is an apocalyptic number.

It is an amenable number.

75121214977 is a deficient number, since it is larger than the sum of its proper divisors (1).

75121214977 is an equidigital number, since it uses as much as digits as its factorization.

75121214977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 46.

The spelling of 75121214977 in words is "seventy-five billion, one hundred twenty-one million, two hundred fourteen thousand, nine hundred seventy-seven".