155620812745 has 4 divisors (see below), whose sum is σ = 186744975300. Its totient is φ = 124496650192.

The previous prime is 155620812689. The next prime is 155620812761. The reversal of 155620812745 is 547218026551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547218026551 = 7 ⋅78174003793.

It can be written as a sum of positive squares in 2 ways, for example, as 122273304976 + 33347507769 = 349676^2 + 182613^2 .

It is a cyclic number.

It is not a de Polignac number, because 155620812745 - 2⁷ = 155620812617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155620812695 and 155620812704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15562081270 + ... + 15562081279.

It is an arithmetic number, because the mean of its divisors is an integer number (46686243825).

Almost surely, 2^155620812745 is an apocalyptic number.

It is an amenable number.

155620812745 is a deficient number, since it is larger than the sum of its proper divisors (31124162555).

155620812745 is an equidigital number, since it uses as much as digits as its factorization.

155620812745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31124162554.

The product of its (nonzero) digits is 672000, while the sum is 46.

The spelling of 155620812745 in words is "one hundred fifty-five billion, six hundred twenty million, eight hundred twelve thousand, seven hundred forty-five".