145420434442 has 4 divisors (see below), whose sum is σ = 218130651666. Its totient is φ = 72710217220.

The previous prime is 145420434433. The next prime is 145420434469. The reversal of 145420434442 is 244434024541.

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., 137506730761 + 7913703681 = 370819^2 + 88959^2 .

It is a super-2 number, since 2×145420434442² (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, 36355108609 + ... + 36355108612.

Almost surely, 2^145420434442 is an apocalyptic number.

145420434442 is a deficient number, since it is larger than the sum of its proper divisors (72710217224).

145420434442 is an equidigital number, since it uses as much as digits as its factorization.

145420434442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72710217223.

The product of its (nonzero) digits is 245760, while the sum is 37.

Adding to 145420434442 its reverse (244434024541), we get a palindrome (389854458983).

The spelling of 145420434442 in words is "one hundred forty-five billion, four hundred twenty million, four hundred thirty-four thousand, four hundred forty-two".