51111010602 has 24 divisors (see below), whose sum is σ = 111984802020. Its totient is φ = 16845576000.

The previous prime is 51111010567. The next prime is 51111010603. The reversal of 51111010602 is 20601011115.

It is a happy number.

51111010602 is a `hidden beast` number, since 51 + 1 + 1 + 1 + 0 + 10 + 602 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46065607641 + 5045402961 = 214629^2 + 71031^2 .

It is a super-2 number, since 2×51111010602² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51111010603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15950649 + ... + 15953852.

Almost surely, 2^51111010602 is an apocalyptic number.

51111010602 is an abundant number, since it is smaller than the sum of its proper divisors (60873791418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51111010602 is a wasteful number, since it uses less digits than its factorization.

51111010602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31904598 (or 31904595 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 18.

Adding to 51111010602 its reverse (20601011115), we get a palindrome (71712021717).

The spelling of 51111010602 in words is "fifty-one billion, one hundred eleven million, ten thousand, six hundred two".