145976790521 has 4 divisors (see below), whose sum is σ = 146820587172. Its totient is φ = 145132993872.

The previous prime is 145976790511. The next prime is 145976790523. The reversal of 145976790521 is 125097679541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125097679541 = 2467 ⋅50708423.

It can be written as a sum of positive squares in 2 ways, for example, as 66995557225 + 78981233296 = 258835^2 + 281036^2 .

It is a cyclic number.

It is not a de Polignac number, because 145976790521 - 2¹⁸ = 145976528377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145976790523) 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, 421898066 + ... + 421898411.

It is an arithmetic number, because the mean of its divisors is an integer number (36705146793).

Almost surely, 2^145976790521 is an apocalyptic number.

It is an amenable number.

145976790521 is a deficient number, since it is larger than the sum of its proper divisors (843796651).

145976790521 is an equidigital number, since it uses as much as digits as its factorization.

145976790521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843796650.

The product of its (nonzero) digits is 4762800, while the sum is 56.

The spelling of 145976790521 in words is "one hundred forty-five billion, nine hundred seventy-six million, seven hundred ninety thousand, five hundred twenty-one".