516221326557 has 112 divisors (see below), whose sum is σ = 825470324800. Its totient is φ = 321755639040.

The previous prime is 516221326541. The next prime is 516221326561. The reversal of 516221326557 is 755623122615.

It is a happy number.

516221326557 is a `hidden beast` number, since 5 + 1 + 62 + 2 + 1 + 32 + 6 + 557 = 666.

It is not a de Polignac number, because 516221326557 - 2⁴ = 516221326541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516221326597) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 499729713 + ... + 499730745.

Almost surely, 2^516221326557 is an apocalyptic number.

516221326557 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

516221326557 is a deficient number, since it is larger than the sum of its proper divisors (309248998243).

516221326557 is a wasteful number, since it uses less digits than its factorization.

516221326557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 1495 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The spelling of 516221326557 in words is "five hundred sixteen billion, two hundred twenty-one million, three hundred twenty-six thousand, five hundred fifty-seven".