721777335372067 has 16 divisors (see below), whose sum is σ = 791966743757280. Its totient is φ = 653683431727872.

The previous prime is 721777335371999. The next prime is 721777335372101. The reversal of 721777335372067 is 760273533777127.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-721777335372067 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721777335371993 and 721777335372011.

It is not an unprimeable number, because it can be changed into a prime (721777335373067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317467068 + ... + 319732534.

It is an arithmetic number, because the mean of its divisors is an integer number (49497921484830).

Almost surely, 2^{721777335372067} is an apocalyptic number.

721777335372067 is a deficient number, since it is larger than the sum of its proper divisors (70189408385213).

721777335372067 is a wasteful number, since it uses less digits than its factorization.

721777335372067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2727942.

The product of its (nonzero) digits is 381182760, while the sum is 67.

The spelling of 721777335372067 in words is "seven hundred twenty-one trillion, seven hundred seventy-seven billion, three hundred thirty-five million, three hundred seventy-two thousand, sixty-seven".