51023235402 has 24 divisors (see below), whose sum is σ = 112362646500. Its totient is φ = 16728929280.

The previous prime is 51023235401. The next prime is 51023235469. The reversal of 51023235402 is 20453232015.

It is a happy number.

51023235402 is a `hidden beast` number, since 5 + 1 + 0 + 23 + 235 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49381283961 + 1641951441 = 222219^2 + 40521^2 .

It is a super-2 number, since 2×51023235402² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51023235401) 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, 23233527 + ... + 23235722.

Almost surely, 2^51023235402 is an apocalyptic number.

51023235402 is an abundant number, since it is smaller than the sum of its proper divisors (61339411098).

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

51023235402 is a wasteful number, since it uses less digits than its factorization.

51023235402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46469318 (or 46469315 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 51023235402 its reverse (20453232015), we get a palindrome (71476467417).

The spelling of 51023235402 in words is "fifty-one billion, twenty-three million, two hundred thirty-five thousand, four hundred two".