516420663545 has 8 divisors (see below), whose sum is σ = 628193903496. Its totient is φ = 407477126016.

The previous prime is 516420663541. The next prime is 516420663607. The reversal of 516420663545 is 545366024615.

It can be written as a sum of positive squares in 4 ways, for example, as 148258111849 + 368162551696 = 385043^2 + 606764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 516420663545 - 2² = 516420663541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 516420663545.

It is not an unprimeable number, because it can be changed into a prime (516420663541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707425202 + ... + 707425931.

It is an arithmetic number, because the mean of its divisors is an integer number (78524237937).

Almost surely, 2^516420663545 is an apocalyptic number.

It is an amenable number.

516420663545 is a deficient number, since it is larger than the sum of its proper divisors (111773239951).

516420663545 is a wasteful number, since it uses less digits than its factorization.

516420663545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414851211.

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 516420663545 in words is "five hundred sixteen billion, four hundred twenty million, six hundred sixty-three thousand, five hundred forty-five".