165722001121555 has 32 divisors (see below), whose sum is σ = 214452160856640. Its totient is φ = 122528751851520.

The previous prime is 165722001121541. The next prime is 165722001121571. The reversal of 165722001121555 is 555121100227561.

It is not a de Polignac number, because 165722001121555 - 2³¹ = 165719853637907 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61280769 + ... + 63927901.

It is an arithmetic number, because the mean of its divisors is an integer number (6701630026770).

Almost surely, 2^{165722001121555} is an apocalyptic number.

165722001121555 is a deficient number, since it is larger than the sum of its proper divisors (48730159735085).

165722001121555 is a wasteful number, since it uses less digits than its factorization.

165722001121555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663271.

The product of its (nonzero) digits is 210000, while the sum is 43.

The spelling of 165722001121555 in words is "one hundred sixty-five trillion, seven hundred twenty-two billion, one million, one hundred twenty-one thousand, five hundred fifty-five".