155880554465 has 4 divisors (see below), whose sum is σ = 187056665364. Its totient is φ = 124704443568.

The previous prime is 155880554449. The next prime is 155880554491. The reversal of 155880554465 is 564455088551.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40205062144 + 115675492321 = 200512^2 + 340111^2 .

It is a cyclic number.

It is not a de Polignac number, because 155880554465 - 2⁴ = 155880554449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155880554465.

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, 15588055442 + ... + 15588055451.

It is an arithmetic number, because the mean of its divisors is an integer number (46764166341).

Almost surely, 2^155880554465 is an apocalyptic number.

It is an amenable number.

155880554465 is a deficient number, since it is larger than the sum of its proper divisors (31176110899).

155880554465 is an equidigital number, since it uses as much as digits as its factorization.

155880554465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31176110898.

The product of its (nonzero) digits is 19200000, while the sum is 56.

The spelling of 155880554465 in words is "one hundred fifty-five billion, eight hundred eighty million, five hundred fifty-four thousand, four hundred sixty-five".