155020020565 has 16 divisors (see below), whose sum is σ = 186276861360. Its totient is φ = 123847557120.

The previous prime is 155020020499. The next prime is 155020020577. The reversal of 155020020565 is 565020020551.

It can be written as a sum of positive squares in 8 ways, for example, as 9402986961 + 145617033604 = 96969^2 + 381598^2 .

It is not a de Polignac number, because 155020020565 - 2¹³ = 155020012373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23006877 + ... + 23013613.

It is an arithmetic number, because the mean of its divisors is an integer number (11642303835).

Almost surely, 2^155020020565 is an apocalyptic number.

It is an amenable number.

155020020565 is a deficient number, since it is larger than the sum of its proper divisors (31256840795).

155020020565 is a wasteful number, since it uses less digits than its factorization.

155020020565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12312.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 155020020565 in words is "one hundred fifty-five billion, twenty million, twenty thousand, five hundred sixty-five".