155720516655651 has 8 divisors (see below), whose sum is σ = 211544852815440. Its totient is φ = 101854929133152.

The previous prime is 155720516655601. The next prime is 155720516655679. The reversal of 155720516655651 is 156556615027551.

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

It is not a de Polignac number, because 155720516655651 - 2¹⁷ = 155720516524579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155720516655601) 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 7 ways as a sum of consecutive naturals, for example, 489687159136 + ... + 489687159453.

It is an arithmetic number, because the mean of its divisors is an integer number (26443106601930).

Almost surely, 2^{155720516655651} is an apocalyptic number.

155720516655651 is a deficient number, since it is larger than the sum of its proper divisors (55824336159789).

155720516655651 is an equidigital number, since it uses as much as digits as its factorization.

155720516655651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979374318645.

The product of its (nonzero) digits is 47250000, while the sum is 60.

The spelling of 155720516655651 in words is "one hundred fifty-five trillion, seven hundred twenty billion, five hundred sixteen million, six hundred fifty-five thousand, six hundred fifty-one".