511021020425 has 18 divisors (see below), whose sum is σ = 673133165418. Its totient is φ = 384768762880.

The previous prime is 511021020383. The next prime is 511021020427. The reversal of 511021020425 is 524020120115.

It can be written as a sum of positive squares in 9 ways, for example, as 28814383504 + 482206636921 = 169748^2 + 694411^2 .

It is not a de Polignac number, because 511021020425 - 2¹⁴ = 511021004041 is a prime.

It is a super-2 number, since 2×511021020425² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 511021020425.

It is not an unprimeable number, because it can be changed into a prime (511021020427) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 35357552 + ... + 35372001.

Almost surely, 2^511021020425 is an apocalyptic number.

It is an amenable number.

511021020425 is a deficient number, since it is larger than the sum of its proper divisors (162112144993).

511021020425 is a wasteful number, since it uses less digits than its factorization.

511021020425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70729597 (or 70729575 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The spelling of 511021020425 in words is "five hundred eleven billion, twenty-one million, twenty thousand, four hundred twenty-five".