155221150415 has 4 divisors (see below), whose sum is σ = 186265380504. Its totient is φ = 124176920328.

The previous prime is 155221150411. The next prime is 155221150423. The reversal of 155221150415 is 514051122551.

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

It is a cyclic number.

It is not a de Polignac number, because 155221150415 - 2² = 155221150411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155221150411) 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, 15522115037 + ... + 15522115046.

It is an arithmetic number, because the mean of its divisors is an integer number (46566345126).

Almost surely, 2^155221150415 is an apocalyptic number.

155221150415 is a deficient number, since it is larger than the sum of its proper divisors (31044230089).

155221150415 is an equidigital number, since it uses as much as digits as its factorization.

155221150415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31044230088.

The product of its (nonzero) digits is 10000, while the sum is 32.

Adding to 155221150415 its reverse (514051122551), we get a palindrome (669272272966).

The spelling of 155221150415 in words is "one hundred fifty-five billion, two hundred twenty-one million, one hundred fifty thousand, four hundred fifteen".