102605543042 has 4 divisors (see below), whose sum is σ = 153908314566. Its totient is φ = 51302771520.

The previous prime is 102605543039. The next prime is 102605543081. The reversal of 102605543042 is 240345506201.

It is a Cunningham number, because it is equal to 320321²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240345506201 = 17 ⋅14137970953.

It can be written as a sum of positive squares in only one way, i.e., 102605543041 + 1 = 320321^2 + 1^2 .

It is a super-2 number, since 2×102605543042² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25651385759 + ... + 25651385762.

Almost surely, 2^102605543042 is an apocalyptic number.

102605543042 is a deficient number, since it is larger than the sum of its proper divisors (51302771524).

102605543042 is an equidigital number, since it uses as much as digits as its factorization.

102605543042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51302771523.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 102605543042 in words is "one hundred two billion, six hundred five million, five hundred forty-three thousand, forty-two".