761117151721 has 6 divisors (see below), whose sum is σ = 803284307322. Its totient is φ = 721058353920.

The previous prime is 761117151709. The next prime is 761117151731. The reversal of 761117151721 is 127151711167.

It can be written as a sum of positive squares in only one way, i.e., 664542888025 + 96574263696 = 815195^2 + 310764^2 .

It is not a de Polignac number, because 761117151721 - 2¹¹ = 761117149673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (761117151731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1054178520 + ... + 1054179241.

It is an arithmetic number, because the mean of its divisors is an integer number (133880717887).

Almost surely, 2^761117151721 is an apocalyptic number.

It is an amenable number.

761117151721 is a deficient number, since it is larger than the sum of its proper divisors (42167155601).

761117151721 is a wasteful number, since it uses less digits than its factorization.

761117151721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108357799 (or 2108357780 counting only the distinct ones).

The product of its digits is 20580, while the sum is 40.

Adding to 761117151721 its reverse (127151711167), we get a palindrome (888268862888).

The spelling of 761117151721 in words is "seven hundred sixty-one billion, one hundred seventeen million, one hundred fifty-one thousand, seven hundred twenty-one".