7491537603691 has 4 divisors (see below), whose sum is σ = 7665759408472. Its totient is φ = 7317315798912.

The previous prime is 7491537603661. The next prime is 7491537603761. The reversal of 7491537603691 is 1963067351947.

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

It is a cyclic number.

It is not a de Polignac number, because 7491537603691 - 2²⁵ = 7491504049259 is a prime.

It is a super-2 number, since 2×7491537603691² (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 (7491537603661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87110902326 + ... + 87110902411.

It is an arithmetic number, because the mean of its divisors is an integer number (1916439852118).

Almost surely, 2^{7491537603691} is an apocalyptic number.

7491537603691 is a deficient number, since it is larger than the sum of its proper divisors (174221804781).

7491537603691 is a wasteful number, since it uses less digits than its factorization.

7491537603691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174221804780.

The product of its (nonzero) digits is 25719120, while the sum is 61.

The spelling of 7491537603691 in words is "seven trillion, four hundred ninety-one billion, five hundred thirty-seven million, six hundred three thousand, six hundred ninety-one".