155621168029 has 16 divisors (see below), whose sum is σ = 166525938880. Its totient is φ = 144988652160.

The previous prime is 155621168023. The next prime is 155621168041. The reversal of 155621168029 is 920861126551.

It is a cyclic number.

It is not a de Polignac number, because 155621168029 - 2³¹ = 153473684381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155621168029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155621168023) 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, 13152214 + ... + 13164040.

It is an arithmetic number, because the mean of its divisors is an integer number (10407871180).

Almost surely, 2^155621168029 is an apocalyptic number.

155621168029 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

155621168029 is a deficient number, since it is larger than the sum of its proper divisors (10904770851).

155621168029 is a wasteful number, since it uses less digits than its factorization.

155621168029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23260.

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 155621168029 in words is "one hundred fifty-five billion, six hundred twenty-one million, one hundred sixty-eight thousand, twenty-nine".