145645704557 has 4 divisors (see below), whose sum is σ = 145646479836. Its totient is φ = 145644929280.

The previous prime is 145645704539. The next prime is 145645704571. The reversal of 145645704557 is 755407546541.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 755407546541 = 5653 ⋅133629497.

It can be written as a sum of positive squares in 2 ways, for example, as 47271891241 + 98373813316 = 217421^2 + 313646^2 .

It is a cyclic number.

It is not a de Polignac number, because 145645704557 - 2¹² = 145645700461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145645704499 and 145645704508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145645704577) 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, 91883 + ... + 547479.

It is an arithmetic number, because the mean of its divisors is an integer number (36411619959).

Almost surely, 2^145645704557 is an apocalyptic number.

It is an amenable number.

145645704557 is a deficient number, since it is larger than the sum of its proper divisors (775279).

145645704557 is an equidigital number, since it uses as much as digits as its factorization.

145645704557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775278.

The product of its (nonzero) digits is 11760000, while the sum is 53.

The spelling of 145645704557 in words is "one hundred forty-five billion, six hundred forty-five million, seven hundred four thousand, five hundred fifty-seven".