102006772747442 has 4 divisors (see below), whose sum is σ = 153010159121166. Its totient is φ = 51003386373720.

The previous prime is 102006772747381. The next prime is 102006772747447. The reversal of 102006772747442 is 244747277600201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 101967402647881 + 39370099561 = 10097891^2 + 198419^2 .

It is not an unprimeable number, because it can be changed into a prime (102006772747447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25501693186859 + ... + 25501693186862.

Almost surely, 2^{102006772747442} is an apocalyptic number.

102006772747442 is a deficient number, since it is larger than the sum of its proper divisors (51003386373724).

102006772747442 is an equidigital number, since it uses as much as digits as its factorization.

102006772747442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51003386373723.

The product of its (nonzero) digits is 7375872, while the sum is 53.

The spelling of 102006772747442 in words is "one hundred two trillion, six billion, seven hundred seventy-two million, seven hundred forty-seven thousand, four hundred forty-two".