155732220217 has 32 divisors (see below), whose sum is σ = 193577861120. Its totient is φ = 122261348160.

The previous prime is 155732220157. The next prime is 155732220283. The reversal of 155732220217 is 712022237551.

It is not a de Polignac number, because 155732220217 - 2³⁵ = 121372481849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155732221217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4364983 + ... + 4400515.

It is an arithmetic number, because the mean of its divisors is an integer number (6049308160).

Almost surely, 2^155732220217 is an apocalyptic number.

It is an amenable number.

155732220217 is a deficient number, since it is larger than the sum of its proper divisors (37845640903).

155732220217 is a wasteful number, since it uses less digits than its factorization.

155732220217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36653.

The product of its (nonzero) digits is 58800, while the sum is 37.

Adding to 155732220217 its reverse (712022237551), we get a palindrome (867754457768).

The spelling of 155732220217 in words is "one hundred fifty-five billion, seven hundred thirty-two million, two hundred twenty thousand, two hundred seventeen".