155312221351 has 16 divisors (see below), whose sum is σ = 178675893760. Its totient is φ = 132244215840.

The previous prime is 155312221333. The next prime is 155312221369. The reversal of 155312221351 is 153122213551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155312221333) and next prime (155312221369).

It is a cyclic number.

It is not a de Polignac number, because 155312221351 - 2²⁷ = 155178003623 is a prime.

It is a super-2 number, since 2×155312221351² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155312221651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1097680 + ... + 1231066.

It is an arithmetic number, because the mean of its divisors is an integer number (11167243360).

Almost surely, 2^155312221351 is an apocalyptic number.

155312221351 is a deficient number, since it is larger than the sum of its proper divisors (23363672409).

155312221351 is a wasteful number, since it uses less digits than its factorization.

155312221351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134494.

The product of its digits is 9000, while the sum is 31.

The spelling of 155312221351 in words is "one hundred fifty-five billion, three hundred twelve million, two hundred twenty-one thousand, three hundred fifty-one".