155720890045 has 8 divisors (see below), whose sum is σ = 213560077824. Its totient is φ = 106780038864.

The previous prime is 155720890033. The next prime is 155720890081. The reversal of 155720890045 is 540098027551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155720890045 - 2⁷ = 155720889917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155720889977 and 155720890004.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2224584109 + ... + 2224584178.

It is an arithmetic number, because the mean of its divisors is an integer number (26695009728).

Almost surely, 2^155720890045 is an apocalyptic number.

It is an amenable number.

155720890045 is a deficient number, since it is larger than the sum of its proper divisors (57839187779).

155720890045 is an equidigital number, since it uses as much as digits as its factorization.

155720890045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449168299.

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 155720890045 in words is "one hundred fifty-five billion, seven hundred twenty million, eight hundred ninety thousand, forty-five".