155701555121 has 4 divisors (see below), whose sum is σ = 177944634432. Its totient is φ = 133458475812.

The previous prime is 155701555103. The next prime is 155701555127. The reversal of 155701555121 is 121555107551.

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 155701555121 - 2¹⁰ = 155701554097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155701555127) 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, 11121539645 + ... + 11121539658.

It is an arithmetic number, because the mean of its divisors is an integer number (44486158608).

Almost surely, 2^155701555121 is an apocalyptic number.

It is an amenable number.

155701555121 is a deficient number, since it is larger than the sum of its proper divisors (22243079311).

155701555121 is an equidigital number, since it uses as much as digits as its factorization.

155701555121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22243079310.

The product of its (nonzero) digits is 43750, while the sum is 38.

The spelling of 155701555121 in words is "one hundred fifty-five billion, seven hundred one million, five hundred fifty-five thousand, one hundred twenty-one".