7261251721217 has 4 divisors (see below), whose sum is σ = 7819809545940. Its totient is φ = 6702693896496.

The previous prime is 7261251721183. The next prime is 7261251721261. The reversal of 7261251721217 is 7121271521627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1787036913601 + 5474214807616 = 1336801^2 + 2339704^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7261251721217 is a prime.

It is a super-2 number, since 2×7261251721217² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7261251741217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279278912342 + ... + 279278912367.

It is an arithmetic number, because the mean of its divisors is an integer number (1954952386485).

Almost surely, 2^{7261251721217} is an apocalyptic number.

It is an amenable number.

7261251721217 is a deficient number, since it is larger than the sum of its proper divisors (558557824723).

7261251721217 is a wasteful number, since it uses less digits than its factorization.

7261251721217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558557824722.

The product of its digits is 164640, while the sum is 44.

The spelling of 7261251721217 in words is "seven trillion, two hundred sixty-one billion, two hundred fifty-one million, seven hundred twenty-one thousand, two hundred seventeen".