155512761310321 has 4 divisors (see below), whose sum is σ = 155517738227712. Its totient is φ = 155507784392932.

The previous prime is 155512761310289. The next prime is 155512761310397. The reversal of 155512761310321 is 123013167215551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155512761310321 - 2⁵ = 155512761310289 is a prime.

It is a super-2 number, since 2×155512761310321² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155512761310121) 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, 2488411825 + ... + 2488474318.

It is an arithmetic number, because the mean of its divisors is an integer number (38879434556928).

Almost surely, 2^{155512761310321} is an apocalyptic number.

It is an amenable number.

155512761310321 is a deficient number, since it is larger than the sum of its proper divisors (4976917391).

155512761310321 is an equidigital number, since it uses as much as digits as its factorization.

155512761310321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4976917390.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 155512761310321 in words is "one hundred fifty-five trillion, five hundred twelve billion, seven hundred sixty-one million, three hundred ten thousand, three hundred twenty-one".