756668157561 has 12 divisors (see below), whose sum is σ = 1093075567792. Its totient is φ = 504394460856.

The previous prime is 756668157559. The next prime is 756668157563. The reversal of 756668157561 is 165751866657.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (756668157559) and next prime (756668157563).

It is not a de Polignac number, because 756668157561 - 2¹ = 756668157559 is a prime.

It is a super-3 number, since 3×756668157561³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (756668157563) 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 11 ways as a sum of consecutive naturals, for example, 4154011 + ... + 4332336.

Almost surely, 2^756668157561 is an apocalyptic number.

It is an amenable number.

756668157561 is a deficient number, since it is larger than the sum of its proper divisors (336407410231).

756668157561 is a wasteful number, since it uses less digits than its factorization.

756668157561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496260 (or 8496257 counting only the distinct ones).

The product of its digits is 63504000, while the sum is 63.

The spelling of 756668157561 in words is "seven hundred fifty-six billion, six hundred sixty-eight million, one hundred fifty-seven thousand, five hundred sixty-one".