7402787370721 has 4 divisors (see below), whose sum is σ = 7402792861444. Its totient is φ = 7402781880000.

The previous prime is 7402787370709. The next prime is 7402787370731. The reversal of 7402787370721 is 1270737872047.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4725928166400 + 2676859204321 = 2173920^2 + 1636111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7402787370721 is a prime.

It is a super-2 number, since 2×7402787370721² (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 (7402787370701) 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 3 ways as a sum of consecutive naturals, for example, 823141 + ... + 3934861.

It is an arithmetic number, because the mean of its divisors is an integer number (1850698215361).

Almost surely, 2^{7402787370721} is an apocalyptic number.

It is an amenable number.

7402787370721 is a deficient number, since it is larger than the sum of its proper divisors (5490723).

7402787370721 is a wasteful number, since it uses less digits than its factorization.

7402787370721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490722.

The product of its (nonzero) digits is 6453888, while the sum is 55.

The spelling of 7402787370721 in words is "seven trillion, four hundred two billion, seven hundred eighty-seven million, three hundred seventy thousand, seven hundred twenty-one".