7481664720129 has 4 divisors (see below), whose sum is σ = 9975552960176. Its totient is φ = 4987776480084.

The previous prime is 7481664720119. The next prime is 7481664720137. The reversal of 7481664720129 is 9210274661847.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7481664720129 - 2⁸ = 7481664719873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7481664720119) 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, 1246944120019 + ... + 1246944120024.

It is an arithmetic number, because the mean of its divisors is an integer number (2493888240044).

Almost surely, 2^{7481664720129} is an apocalyptic number.

It is an amenable number.

7481664720129 is a deficient number, since it is larger than the sum of its proper divisors (2493888240047).

7481664720129 is a wasteful number, since it uses less digits than its factorization.

7481664720129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493888240046.

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 7481664720129 in words is "seven trillion, four hundred eighty-one billion, six hundred sixty-four million, seven hundred twenty thousand, one hundred twenty-nine".