145869228961 has 4 divisors (see below), whose sum is σ = 145870609300. Its totient is φ = 145867848624.

The previous prime is 145869228931. The next prime is 145869228991. The reversal of 145869228961 is 169822968541.

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

It is an interprime number because it is at equal distance from previous prime (145869228931) and next prime (145869228991).

It can be written as a sum of positive squares in 2 ways, for example, as 68896275361 + 76972953600 = 262481^2 + 277440^2 .

It is a cyclic number.

It is not a de Polignac number, because 145869228961 - 2²⁹ = 145332358049 is a prime.

It is a super-2 number, since 2×145869228961² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145869228961.

It is not an unprimeable number, because it can be changed into a prime (145869228931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517206 + ... + 747823.

It is an arithmetic number, because the mean of its divisors is an integer number (36467652325).

Almost surely, 2^145869228961 is an apocalyptic number.

It is an amenable number.

145869228961 is a deficient number, since it is larger than the sum of its proper divisors (1380339).

145869228961 is a wasteful number, since it uses less digits than its factorization.

145869228961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380338.

The product of its digits is 14929920, while the sum is 61.

The spelling of 145869228961 in words is "one hundred forty-five billion, eight hundred sixty-nine million, two hundred twenty-eight thousand, nine hundred sixty-one".