747731775621 has 16 divisors (see below), whose sum is σ = 1038034686528. Its totient is φ = 478356988800.

The previous prime is 747731775619. The next prime is 747731775631. The reversal of 747731775621 is 126577137747.

It is not a de Polignac number, because 747731775621 - 2¹ = 747731775619 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747731775611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49821351 + ... + 49836356.

It is an arithmetic number, because the mean of its divisors is an integer number (64877167908).

Almost surely, 2^747731775621 is an apocalyptic number.

It is an amenable number.

747731775621 is a deficient number, since it is larger than the sum of its proper divisors (290302910907).

747731775621 is a wasteful number, since it uses less digits than its factorization.

747731775621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99657812.

The product of its digits is 12101040, while the sum is 57.

The spelling of 747731775621 in words is "seven hundred forty-seven billion, seven hundred thirty-one million, seven hundred seventy-five thousand, six hundred twenty-one".