155151221552401 has 16 divisors (see below), whose sum is σ = 166656521049984. Its totient is φ = 144061081300224.

The previous prime is 155151221552363. The next prime is 155151221552449. The reversal of 155151221552401 is 104255122151551.

It is a cyclic number.

It is not a de Polignac number, because 155151221552401 - 2¹⁹ = 155151221028113 is a prime.

It is a super-3 number, since 3×155151221552401³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155151221552501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210158491 + ... + 210895456.

It is an arithmetic number, because the mean of its divisors is an integer number (10416032565624).

Almost surely, 2^{155151221552401} is an apocalyptic number.

It is an amenable number.

155151221552401 is a deficient number, since it is larger than the sum of its proper divisors (11505299497583).

155151221552401 is a wasteful number, since it uses less digits than its factorization.

155151221552401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421054440.

The product of its (nonzero) digits is 100000, while the sum is 40.

The spelling of 155151221552401 in words is "one hundred fifty-five trillion, one hundred fifty-one billion, two hundred twenty-one million, five hundred fifty-two thousand, four hundred one".