145565601556 has 6 divisors (see below), whose sum is σ = 254739802730. Its totient is φ = 72782800776.

The previous prime is 145565601547. The next prime is 145565601637. The reversal of 145565601556 is 655106565541.

It can be written as a sum of positive squares in only one way, i.e., 98526932100 + 47038669456 = 313890^2 + 216884^2 .

It is a super-2 number, since 2×145565601556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18195700191 + ... + 18195700198.

Almost surely, 2^145565601556 is an apocalyptic number.

It is an amenable number.

145565601556 is a deficient number, since it is larger than the sum of its proper divisors (109174201174).

145565601556 is a wasteful number, since it uses less digits than its factorization.

145565601556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36391400393 (or 36391400391 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 49.

The spelling of 145565601556 in words is "one hundred forty-five billion, five hundred sixty-five million, six hundred one thousand, five hundred fifty-six".